TabContents -> WebContentsImpl, part 3.

content/browser/tab_contents/navigation_controller_impl.cc

Index: content/browser/tab_contents/navigation_controller_impl.cc
diff --git a/content/browser/tab_contents/navigation_controller_impl.cc b/content/browser/tab_contents/navigation_controller_impl.cc
deleted file mode 100644
index dbdc940078290db4681c3b4072cd13bbdad31a7d..0000000000000000000000000000000000000000
--- a/content/browser/tab_contents/navigation_controller_impl.cc
+++ /dev/null
@@ -1,1441 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "content/browser/tab_contents/navigation_controller_impl.h"
-
-#include "base/file_util.h"
-#include "base/logging.h"
-#include "base/string_number_conversions.h"  // Temporary
-#include "base/string_util.h"
-#include "base/time.h"
-#include "base/utf_string_conversions.h"
-#include "content/browser/browser_url_handler_impl.h"
-#include "content/browser/child_process_security_policy_impl.h"
-#include "content/browser/in_process_webkit/dom_storage_context_impl.h"
-#include "content/browser/in_process_webkit/session_storage_namespace_impl.h"
-#include "content/browser/renderer_host/render_view_host_impl.h"  // Temporary
-#include "content/browser/site_instance_impl.h"
-#include "content/browser/tab_contents/debug_urls.h"
-#include "content/browser/tab_contents/interstitial_page_impl.h"
-#include "content/browser/tab_contents/navigation_entry_impl.h"
-#include "content/browser/tab_contents/tab_contents.h"
-#include "content/common/view_messages.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/invalidate_type.h"
-#include "content/public/browser/navigation_details.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/notification_types.h"
-#include "content/public/browser/user_metrics.h"
-#include "content/public/browser/web_contents_delegate.h"
-#include "content/public/common/content_constants.h"
-#include "net/base/escape.h"
-#include "net/base/mime_util.h"
-#include "net/base/net_util.h"
-#include "webkit/glue/webkit_glue.h"
-
-using content::BrowserContext;
-using content::DOMStorageContext;
-using content::GlobalRequestID;
-using content::NavigationController;
-using content::NavigationEntry;
-using content::NavigationEntryImpl;
-using content::RenderViewHostImpl;
-using content::SessionStorageNamespace;
-using content::SiteInstance;
-using content::UserMetricsAction;
-using content::WebContents;
-
-namespace {
-
-const int kInvalidateAll = 0xFFFFFFFF;
-
-// Invoked when entries have been pruned, or removed. For example, if the
-// current entries are [google, digg, yahoo], with the current entry google,
-// and the user types in cnet, then digg and yahoo are pruned.
-void NotifyPrunedEntries(NavigationControllerImpl* nav_controller,
-                         bool from_front,
-                         int count) {
-  content::PrunedDetails details;
-  details.from_front = from_front;
-  details.count = count;
-  content::NotificationService::current()->Notify(
-      content::NOTIFICATION_NAV_LIST_PRUNED,
-      content::Source<NavigationController>(nav_controller),
-      content::Details<content::PrunedDetails>(&details));
-}
-
-// Ensure the given NavigationEntry has a valid state, so that WebKit does not
-// get confused if we navigate back to it.
-//
-// An empty state is treated as a new navigation by WebKit, which would mean
-// losing the navigation entries and generating a new navigation entry after
-// this one. We don't want that. To avoid this we create a valid state which
-// WebKit will not treat as a new navigation.
-void SetContentStateIfEmpty(NavigationEntryImpl* entry) {
-  if (entry->GetContentState().empty()) {
-    entry->SetContentState(
-        webkit_glue::CreateHistoryStateForURL(entry->GetURL()));
-  }
-}
-
-// Configure all the NavigationEntries in entries for restore. This resets
-// the transition type to reload and makes sure the content state isn't empty.
-void ConfigureEntriesForRestore(
-    std::vector<linked_ptr<NavigationEntryImpl> >* entries,
-    bool from_last_session) {
-  for (size_t i = 0; i < entries->size(); ++i) {
-    // Use a transition type of reload so that we don't incorrectly increase
-    // the typed count.
-    (*entries)[i]->SetTransitionType(content::PAGE_TRANSITION_RELOAD);
-    (*entries)[i]->set_restore_type(from_last_session ?
-        NavigationEntryImpl::RESTORE_LAST_SESSION :
-        NavigationEntryImpl::RESTORE_CURRENT_SESSION);
-    // NOTE(darin): This code is only needed for backwards compat.
-    SetContentStateIfEmpty((*entries)[i].get());
-  }
-}
-
-// See NavigationController::IsURLInPageNavigation for how this works and why.
-bool AreURLsInPageNavigation(const GURL& existing_url, const GURL& new_url) {
-  if (existing_url == new_url || !new_url.has_ref()) {
-    // TODO(jcampan): what about when navigating back from a ref URL to the top
-    // non ref URL? Nothing is loaded in that case but we return false here.
-    // The user could also navigate from the ref URL to the non ref URL by
-    // entering the non ref URL in the location bar or through a bookmark, in
-    // which case there would be a load.  I am not sure if the non-load/load
-    // scenarios can be differentiated with the TransitionType.
-    return false;
-  }
-
-  url_canon::Replacements<char> replacements;
-  replacements.ClearRef();
-  return existing_url.ReplaceComponents(replacements) ==
-      new_url.ReplaceComponents(replacements);
-}
-
-}  // namespace
-
-// NavigationControllerImpl ----------------------------------------------------
-
-const size_t kMaxEntryCountForTestingNotSet = -1;
-
-// static
-size_t NavigationControllerImpl::max_entry_count_for_testing_ =
-    kMaxEntryCountForTestingNotSet;
-
- // Should Reload check for post data? The default is true, but is set to false
-// when testing.
-static bool g_check_for_repost = true;
-
-namespace content {
-// static
-NavigationEntry* NavigationController::CreateNavigationEntry(
-      const GURL& url,
-      const Referrer& referrer,
-      PageTransition transition,
-      bool is_renderer_initiated,
-      const std::string& extra_headers,
-      BrowserContext* browser_context) {
-  // Allow the browser URL handler to rewrite the URL. This will, for example,
-  // remove "view-source:" from the beginning of the URL to get the URL that
-  // will actually be loaded. This real URL won't be shown to the user, just
-  // used internally.
-  GURL loaded_url(url);
-  bool reverse_on_redirect = false;
-  BrowserURLHandlerImpl::GetInstance()->RewriteURLIfNecessary(
-      &loaded_url, browser_context, &reverse_on_redirect);
-
-  NavigationEntryImpl* entry = new NavigationEntryImpl(
-      NULL,  // The site instance for tabs is sent on navigation
-             // (TabContents::GetSiteInstance).
-      -1,
-      loaded_url,
-      referrer,
-      string16(),
-      transition,
-      is_renderer_initiated);
-  entry->SetVirtualURL(url);
-  entry->set_user_typed_url(url);
-  entry->set_update_virtual_url_with_url(reverse_on_redirect);
-  entry->set_extra_headers(extra_headers);
-  return entry;
-}
-
-// static
-void NavigationController::DisablePromptOnRepost() {
-  g_check_for_repost = false;
-}
-
-}  // namespace content
-
-NavigationControllerImpl::NavigationControllerImpl(
-    TabContents* contents,
-    BrowserContext* browser_context,
-    SessionStorageNamespaceImpl* session_storage_namespace)
-    : browser_context_(browser_context),
-      pending_entry_(NULL),
-      last_committed_entry_index_(-1),
-      pending_entry_index_(-1),
-      transient_entry_index_(-1),
-      tab_contents_(contents),
-      max_restored_page_id_(-1),
-      ALLOW_THIS_IN_INITIALIZER_LIST(ssl_manager_(this)),
-      needs_reload_(false),
-      session_storage_namespace_(session_storage_namespace),
-      pending_reload_(NO_RELOAD) {
-  DCHECK(browser_context_);
-  if (!session_storage_namespace_) {
-    session_storage_namespace_ = new SessionStorageNamespaceImpl(
-        static_cast<DOMStorageContextImpl*>(
-            BrowserContext::GetDOMStorageContext(browser_context_)));
-  }
-}
-
-NavigationControllerImpl::~NavigationControllerImpl() {
-  DiscardNonCommittedEntriesInternal();
-
-  content::NotificationService::current()->Notify(
-      content::NOTIFICATION_TAB_CLOSED,
-      content::Source<NavigationController>(this),
-      content::NotificationService::NoDetails());
-}
-
-WebContents* NavigationControllerImpl::GetWebContents() const {
-  return tab_contents_;
-}
-
-BrowserContext* NavigationControllerImpl::GetBrowserContext() const {
-  return browser_context_;
-}
-
-void NavigationControllerImpl::SetBrowserContext(
-    BrowserContext* browser_context) {
-  browser_context_ = browser_context;
-}
-
-void NavigationControllerImpl::Restore(
-    int selected_navigation,
-    bool from_last_session,
-    std::vector<NavigationEntry*>* entries) {
-  // Verify that this controller is unused and that the input is valid.
-  DCHECK(GetEntryCount() == 0 && !GetPendingEntry());
-  DCHECK(selected_navigation >= 0 &&
-         selected_navigation < static_cast<int>(entries->size()));
-
-  needs_reload_ = true;
-  for (size_t i = 0; i < entries->size(); ++i) {
-    NavigationEntryImpl* entry =
-        NavigationEntryImpl::FromNavigationEntry((*entries)[i]);
-    entries_.push_back(linked_ptr<NavigationEntryImpl>(entry));
-  }
-  entries->clear();
-
-  // And finish the restore.
-  FinishRestore(selected_navigation, from_last_session);
-}
-
-void NavigationControllerImpl::Reload(bool check_for_repost) {
-  ReloadInternal(check_for_repost, RELOAD);
-}
-void NavigationControllerImpl::ReloadIgnoringCache(bool check_for_repost) {
-  ReloadInternal(check_for_repost, RELOAD_IGNORING_CACHE);
-}
-
-void NavigationControllerImpl::ReloadInternal(bool check_for_repost,
-                                              ReloadType reload_type) {
-  // Reloading a transient entry does nothing.
-  if (transient_entry_index_ != -1)
-    return;
-
-  DiscardNonCommittedEntriesInternal();
-  int current_index = GetCurrentEntryIndex();
-  // If we are no where, then we can't reload.  TODO(darin): We should add a
-  // CanReload method.
-  if (current_index == -1) {
-    return;
-  }
-
-  if (g_check_for_repost && check_for_repost &&
-      GetEntryAtIndex(current_index)->GetHasPostData()) {
-    // The user is asking to reload a page with POST data. Prompt to make sure
-    // they really want to do this. If they do, the dialog will call us back
-    // with check_for_repost = false.
-    content::NotificationService::current()->Notify(
-        content::NOTIFICATION_REPOST_WARNING_SHOWN,
-        content::Source<NavigationController>(this),
-        content::NotificationService::NoDetails());
-
-    pending_reload_ = reload_type;
-    tab_contents_->Activate();
-    tab_contents_->GetDelegate()->ShowRepostFormWarningDialog(tab_contents_);
-  } else {
-    DiscardNonCommittedEntriesInternal();
-
-    NavigationEntryImpl* entry = entries_[current_index].get();
-    SiteInstanceImpl* site_instance = entry->site_instance();
-    DCHECK(site_instance);
-
-    // If we are reloading an entry that no longer belongs to the current
-    // site instance (for example, refreshing a page for just installed app),
-    // the reload must happen in a new process.
-    // The new entry must have a new page_id and site instance, so it behaves
-    // as new navigation (which happens to clear forward history).
-    // Tabs that are discarded due to low memory conditions may not have a site
-    // instance, and should not be treated as a cross-site reload.
-    if (site_instance &&
-        site_instance->HasWrongProcessForURL(entry->GetURL())) {
-      // Create a navigation entry that resembles the current one, but do not
-      // copy page id, site instance, and content state.
-      NavigationEntryImpl* nav_entry = NavigationEntryImpl::FromNavigationEntry(
-          CreateNavigationEntry(
-              entry->GetURL(), entry->GetReferrer(), entry->GetTransitionType(),
-              false, entry->extra_headers(), browser_context_));
-
-      // Mark the reload type as NO_RELOAD, so navigation will not be considered
-      // a reload in the renderer.
-      reload_type = NavigationController::NO_RELOAD;
-
-      nav_entry->set_is_cross_site_reload(true);
-      pending_entry_ = nav_entry;
-    } else {
-      pending_entry_index_ = current_index;
-
-      // The title of the page being reloaded might have been removed in the
-      // meanwhile, so we need to revert to the default title upon reload and
-      // invalidate the previously cached title (SetTitle will do both).
-      // See Chromium issue 96041.
-      entries_[pending_entry_index_]->SetTitle(string16());
-
-      entries_[pending_entry_index_]->SetTransitionType(
-          content::PAGE_TRANSITION_RELOAD);
-    }
-
-    NavigateToPendingEntry(reload_type);
-  }
-}
-
-void NavigationControllerImpl::CancelPendingReload() {
-  DCHECK(pending_reload_ != NO_RELOAD);
-  pending_reload_ = NO_RELOAD;
-}
-
-void NavigationControllerImpl::ContinuePendingReload() {
-  if (pending_reload_ == NO_RELOAD) {
-    NOTREACHED();
-  } else {
-    ReloadInternal(false, pending_reload_);
-    pending_reload_ = NO_RELOAD;
-  }
-}
-
-bool NavigationControllerImpl::IsInitialNavigation() {
-  return last_document_loaded_.is_null();
-}
-
-NavigationEntryImpl* NavigationControllerImpl::GetEntryWithPageID(
-  SiteInstance* instance, int32 page_id) const {
-  int index = GetEntryIndexWithPageID(instance, page_id);
-  return (index != -1) ? entries_[index].get() : NULL;
-}
-
-void NavigationControllerImpl::LoadEntry(NavigationEntryImpl* entry) {
-  // Don't navigate to URLs disabled by policy. This prevents showing the URL
-  // on the Omnibar when it is also going to be blocked by
-  // ChildProcessSecurityPolicy::CanRequestURL.
-  ChildProcessSecurityPolicyImpl* policy =
-      ChildProcessSecurityPolicyImpl::GetInstance();
-  if (policy->IsDisabledScheme(entry->GetURL().scheme()) ||
-      policy->IsDisabledScheme(entry->GetVirtualURL().scheme())) {
-    VLOG(1) << "URL not loaded because the scheme is blocked by policy: "
-            << entry->GetURL();
-    delete entry;
-    return;
-  }
-
-  // When navigating to a new page, we don't know for sure if we will actually
-  // end up leaving the current page.  The new page load could for example
-  // result in a download or a 'no content' response (e.g., a mailto: URL).
-  DiscardNonCommittedEntriesInternal();
-  pending_entry_ = entry;
-  content::NotificationService::current()->Notify(
-      content::NOTIFICATION_NAV_ENTRY_PENDING,
-      content::Source<NavigationController>(this),
-      content::Details<NavigationEntry>(entry));
-  NavigateToPendingEntry(NO_RELOAD);
-}
-
-NavigationEntry* NavigationControllerImpl::GetActiveEntry() const {
-  if (transient_entry_index_ != -1)
-    return entries_[transient_entry_index_].get();
-  if (pending_entry_)
-    return pending_entry_;
-  return GetLastCommittedEntry();
-}
-
-NavigationEntry* NavigationControllerImpl::GetVisibleEntry() const {
-  if (transient_entry_index_ != -1)
-    return entries_[transient_entry_index_].get();
-  // Only return the pending_entry for new (non-history), browser-initiated
-  // navigations, in order to prevent URL spoof attacks.
-  // Ideally we would also show the pending entry's URL for new renderer-
-  // initiated navigations with no last committed entry (e.g., a link opening
-  // in a new tab), but an attacker can insert content into the about:blank
-  // page while the pending URL loads in that case.
-  if (pending_entry_ &&
-      pending_entry_->GetPageID() == -1 &&
-      !pending_entry_->is_renderer_initiated())
-    return pending_entry_;
-  return GetLastCommittedEntry();
-}
-
-int NavigationControllerImpl::GetCurrentEntryIndex() const {
-  if (transient_entry_index_ != -1)
-    return transient_entry_index_;
-  if (pending_entry_index_ != -1)
-    return pending_entry_index_;
-  return last_committed_entry_index_;
-}
-
-NavigationEntry* NavigationControllerImpl::GetLastCommittedEntry() const {
-  if (last_committed_entry_index_ == -1)
-    return NULL;
-  return entries_[last_committed_entry_index_].get();
-}
-
-bool NavigationControllerImpl::CanViewSource() const {
-  bool is_supported_mime_type = net::IsSupportedNonImageMimeType(
-      tab_contents_->GetContentsMimeType().c_str());
-  NavigationEntry* active_entry = GetActiveEntry();
-  return active_entry && !active_entry->IsViewSourceMode() &&
-    is_supported_mime_type && !tab_contents_->GetInterstitialPage();
-}
-
-int NavigationControllerImpl::GetLastCommittedEntryIndex() const {
-  return last_committed_entry_index_;
-}
-
-int NavigationControllerImpl::GetEntryCount() const {
-  DCHECK(entries_.size() <= max_entry_count());
-  return static_cast<int>(entries_.size());
-}
-
-NavigationEntry* NavigationControllerImpl::GetEntryAtIndex(
-    int index) const {
-  return entries_.at(index).get();
-}
-
-NavigationEntry* NavigationControllerImpl::GetEntryAtOffset(
-    int offset) const {
-  int index = (transient_entry_index_ != -1) ?
-                  transient_entry_index_ + offset :
-                  last_committed_entry_index_ + offset;
-  if (index < 0 || index >= GetEntryCount())
-    return NULL;
-
-  return entries_[index].get();
-}
-
-bool NavigationControllerImpl::CanGoBack() const {
-  return entries_.size() > 1 && GetCurrentEntryIndex() > 0;
-}
-
-bool NavigationControllerImpl::CanGoForward() const {
-  int index = GetCurrentEntryIndex();
-  return index >= 0 && index < (static_cast<int>(entries_.size()) - 1);
-}
-
-void NavigationControllerImpl::GoBack() {
-  if (!CanGoBack()) {
-    NOTREACHED();
-    return;
-  }
-
-  // Base the navigation on where we are now...
-  int current_index = GetCurrentEntryIndex();
-
-  DiscardNonCommittedEntries();
-
-  pending_entry_index_ = current_index - 1;
-  entries_[pending_entry_index_]->SetTransitionType(
-      content::PageTransitionFromInt(
-          entries_[pending_entry_index_]->GetTransitionType() |
-          content::PAGE_TRANSITION_FORWARD_BACK));
-  NavigateToPendingEntry(NO_RELOAD);
-}
-
-void NavigationControllerImpl::GoForward() {
-  if (!CanGoForward()) {
-    NOTREACHED();
-    return;
-  }
-
-  bool transient = (transient_entry_index_ != -1);
-
-  // Base the navigation on where we are now...
-  int current_index = GetCurrentEntryIndex();
-
-  DiscardNonCommittedEntries();
-
-  pending_entry_index_ = current_index;
-  // If there was a transient entry, we removed it making the current index
-  // the next page.
-  if (!transient)
-    pending_entry_index_++;
-
-  entries_[pending_entry_index_]->SetTransitionType(
-      content::PageTransitionFromInt(
-          entries_[pending_entry_index_]->GetTransitionType() |
-          content::PAGE_TRANSITION_FORWARD_BACK));
-  NavigateToPendingEntry(NO_RELOAD);
-}
-
-void NavigationControllerImpl::GoToIndex(int index) {
-  if (index < 0 || index >= static_cast<int>(entries_.size())) {
-    NOTREACHED();
-    return;
-  }
-
-  if (transient_entry_index_ != -1) {
-    if (index == transient_entry_index_) {
-      // Nothing to do when navigating to the transient.
-      return;
-    }
-    if (index > transient_entry_index_) {
-      // Removing the transient is goint to shift all entries by 1.
-      index--;
-    }
-  }
-
-  DiscardNonCommittedEntries();
-
-  pending_entry_index_ = index;
-  entries_[pending_entry_index_]->SetTransitionType(
-      content::PageTransitionFromInt(
-          entries_[pending_entry_index_]->GetTransitionType() |
-          content::PAGE_TRANSITION_FORWARD_BACK));
-  NavigateToPendingEntry(NO_RELOAD);
-}
-
-void NavigationControllerImpl::GoToOffset(int offset) {
-  int index = (transient_entry_index_ != -1) ?
-                  transient_entry_index_ + offset :
-                  last_committed_entry_index_ + offset;
-  if (index < 0 || index >= GetEntryCount())
-    return;
-
-  GoToIndex(index);
-}
-
-void NavigationControllerImpl::RemoveEntryAtIndex(int index) {
-  if (index == last_committed_entry_index_)
-    return;
-
-  RemoveEntryAtIndexInternal(index);
-}
-
-void NavigationControllerImpl::UpdateVirtualURLToURL(
-    NavigationEntryImpl* entry, const GURL& new_url) {
-  GURL new_virtual_url(new_url);
-  if (BrowserURLHandlerImpl::GetInstance()->ReverseURLRewrite(
-          &new_virtual_url, entry->GetVirtualURL(), browser_context_)) {
-    entry->SetVirtualURL(new_virtual_url);
-  }
-}
-
-void NavigationControllerImpl::AddTransientEntry(NavigationEntryImpl* entry) {
-  // Discard any current transient entry, we can only have one at a time.
-  int index = 0;
-  if (last_committed_entry_index_ != -1)
-    index = last_committed_entry_index_ + 1;
-  DiscardTransientEntry();
-  entries_.insert(
-      entries_.begin() + index, linked_ptr<NavigationEntryImpl>(entry));
-  transient_entry_index_ = index;
-  tab_contents_->NotifyNavigationStateChanged(kInvalidateAll);
-}
-
-void NavigationControllerImpl::TransferURL(
-    const GURL& url,
-    const content::Referrer& referrer,
-    content::PageTransition transition,
-    const std::string& extra_headers,
-    const GlobalRequestID& transferred_global_request_id,
-    bool is_renderer_initiated) {
-  // The user initiated a load, we don't need to reload anymore.
-  needs_reload_ = false;
-
-  NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
-      CreateNavigationEntry(
-          url, referrer, transition, is_renderer_initiated, extra_headers,
-          browser_context_));
-  entry->set_transferred_global_request_id(transferred_global_request_id);
-
-  LoadEntry(entry);
-}
-
-void NavigationControllerImpl::LoadURL(
-    const GURL& url,
-    const content::Referrer& referrer,
-    content::PageTransition transition,
-    const std::string& extra_headers) {
-  if (content::HandleDebugURL(url, transition))
-    return;
-
-  // The user initiated a load, we don't need to reload anymore.
-  needs_reload_ = false;
-
-  NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
-      CreateNavigationEntry(
-          url, referrer, transition, false, extra_headers, browser_context_));
-
-  LoadEntry(entry);
-}
-
-void NavigationControllerImpl::LoadURLFromRenderer(
-    const GURL& url,
-    const content::Referrer& referrer,
-    content::PageTransition transition,
-    const std::string& extra_headers) {
-  // The user initiated a load, we don't need to reload anymore.
-  needs_reload_ = false;
-
-  NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
-      CreateNavigationEntry(
-          url, referrer, transition, true, extra_headers, browser_context_));
-
-  LoadEntry(entry);
-}
-
-void NavigationControllerImpl::DocumentLoadedInFrame() {
-  last_document_loaded_ = base::TimeTicks::Now();
-}
-
-bool NavigationControllerImpl::RendererDidNavigate(
-    const ViewHostMsg_FrameNavigate_Params& params,
-    content::LoadCommittedDetails* details) {
-
-  // Save the previous state before we clobber it.
-  if (GetLastCommittedEntry()) {
-    details->previous_url = GetLastCommittedEntry()->GetURL();
-    details->previous_entry_index = GetLastCommittedEntryIndex();
-  } else {
-    details->previous_url = GURL();
-    details->previous_entry_index = -1;
-  }
-
-  // If we have a pending entry at this point, it should have a SiteInstance.
-  // Restored entries start out with a null SiteInstance, but we should have
-  // assigned one in NavigateToPendingEntry.
-  DCHECK(pending_entry_index_ == -1 || pending_entry_->site_instance());
-
-  // If we are doing a cross-site reload, we need to replace the existing
-  // navigation entry, not add another entry to the history. This has the side
-  // effect of removing forward browsing history, if such existed.
-  if (pending_entry_ != NULL) {
-    details->did_replace_entry = pending_entry_->is_cross_site_reload();
-  }
-
-  // is_in_page must be computed before the entry gets committed.
-  details->is_in_page = IsURLInPageNavigation(params.url);
-
-  // Do navigation-type specific actions. These will make and commit an entry.
-  details->type = ClassifyNavigation(params);
-
-  switch (details->type) {
-    case content::NAVIGATION_TYPE_NEW_PAGE:
-      RendererDidNavigateToNewPage(params, &(details->did_replace_entry));
-      break;
-    case content::NAVIGATION_TYPE_EXISTING_PAGE:
-      RendererDidNavigateToExistingPage(params);
-      break;
-    case content::NAVIGATION_TYPE_SAME_PAGE:
-      RendererDidNavigateToSamePage(params);
-      break;
-    case content::NAVIGATION_TYPE_IN_PAGE:
-      RendererDidNavigateInPage(params, &(details->did_replace_entry));
-      break;
-    case content::NAVIGATION_TYPE_NEW_SUBFRAME:
-      RendererDidNavigateNewSubframe(params);
-      break;
-    case content::NAVIGATION_TYPE_AUTO_SUBFRAME:
-      if (!RendererDidNavigateAutoSubframe(params))
-        return false;
-      break;
-    case content::NAVIGATION_TYPE_NAV_IGNORE:
-      // If a pending navigation was in progress, this canceled it.  We should
-      // discard it and make sure it is removed from the URL bar.  After that,
-      // there is nothing we can do with this navigation, so we just return to
-      // the caller that nothing has happened.
-      if (pending_entry_) {
-        DiscardNonCommittedEntries();
-        tab_contents_->NotifyNavigationStateChanged(
-            content::INVALIDATE_TYPE_URL);
-      }
-      return false;
-    default:
-      NOTREACHED();
-  }
-
-  // All committed entries should have nonempty content state so WebKit doesn't
-  // get confused when we go back to them (see the function for details).
-  DCHECK(!params.content_state.empty());
-  NavigationEntryImpl* active_entry =
-      NavigationEntryImpl::FromNavigationEntry(GetActiveEntry());
-  active_entry->SetContentState(params.content_state);
-
-  // Once committed, we do not need to track if the entry was initiated by
-  // the renderer.
-  active_entry->set_is_renderer_initiated(false);
-
-  // The active entry's SiteInstance should match our SiteInstance.
-  DCHECK(active_entry->site_instance() == tab_contents_->GetSiteInstance());
-
-  // Now prep the rest of the details for the notification and broadcast.
-  details->entry = active_entry;
-  details->is_main_frame =
-      content::PageTransitionIsMainFrame(params.transition);
-  details->serialized_security_info = params.security_info;
-  details->http_status_code = params.http_status_code;
-  NotifyNavigationEntryCommitted(details);
-
-  return true;
-}
-
-content::NavigationType NavigationControllerImpl::ClassifyNavigation(
-    const ViewHostMsg_FrameNavigate_Params& params) const {
-  if (params.page_id == -1) {
-    // The renderer generates the page IDs, and so if it gives us the invalid
-    // page ID (-1) we know it didn't actually navigate. This happens in a few
-    // cases:
-    //
-    // - If a page makes a popup navigated to about blank, and then writes
-    //   stuff like a subframe navigated to a real page. We'll get the commit
-    //   for the subframe, but there won't be any commit for the outer page.
-    //
-    // - We were also getting these for failed loads (for example, bug 21849).
-    //   The guess is that we get a "load commit" for the alternate error page,
-    //   but that doesn't affect the page ID, so we get the "old" one, which
-    //   could be invalid. This can also happen for a cross-site transition
-    //   that causes us to swap processes. Then the error page load will be in
-    //   a new process with no page IDs ever assigned (and hence a -1 value),
-    //   yet the navigation controller still might have previous pages in its
-    //   list.
-    //
-    // In these cases, there's nothing we can do with them, so ignore.
-    return content::NAVIGATION_TYPE_NAV_IGNORE;
-  }
-
-  if (params.page_id > tab_contents_->GetMaxPageID()) {
-    // Greater page IDs than we've ever seen before are new pages. We may or may
-    // not have a pending entry for the page, and this may or may not be the
-    // main frame.
-    if (content::PageTransitionIsMainFrame(params.transition))
-      return content::NAVIGATION_TYPE_NEW_PAGE;
-
-    // When this is a new subframe navigation, we should have a committed page
-    // for which it's a suframe in. This may not be the case when an iframe is
-    // navigated on a popup navigated to about:blank (the iframe would be
-    // written into the popup by script on the main page). For these cases,
-    // there isn't any navigation stuff we can do, so just ignore it.
-    if (!GetLastCommittedEntry())
-      return content::NAVIGATION_TYPE_NAV_IGNORE;
-
-    // Valid subframe navigation.
-    return content::NAVIGATION_TYPE_NEW_SUBFRAME;
-  }
-
-  // Now we know that the notification is for an existing page. Find that entry.
-  int existing_entry_index = GetEntryIndexWithPageID(
-      tab_contents_->GetSiteInstance(),
-      params.page_id);
-  if (existing_entry_index == -1) {
-    // The page was not found. It could have been pruned because of the limit on
-    // back/forward entries (not likely since we'll usually tell it to navigate
-    // to such entries). It could also mean that the renderer is smoking crack.
-    NOTREACHED();
-
-    // Because the unknown entry has committed, we risk showing the wrong URL in
-    // release builds. Instead, we'll kill the renderer process to be safe.
-    LOG(ERROR) << "terminating renderer for bad navigation: " << params.url;
-    content::RecordAction(UserMetricsAction("BadMessageTerminate_NC"));
-
-    // Temporary code so we can get more information.  Format:
-    //  http://url/foo.html#page1#max3#frame1#ids:2_Nx,1_1x,3_2
-    std::string temp = params.url.spec();
-    temp.append("#page");
-    temp.append(base::IntToString(params.page_id));
-    temp.append("#max");
-    temp.append(base::IntToString(tab_contents_->GetMaxPageID()));
-    temp.append("#frame");
-    temp.append(base::IntToString(params.frame_id));
-    temp.append("#ids");
-    for (int i = 0; i < static_cast<int>(entries_.size()); ++i) {
-      // Append entry metadata (e.g., 3_7x):
-      //  3: page_id
-      //  7: SiteInstance ID, or N for null
-      //  x: appended if not from the current SiteInstance
-      temp.append(base::IntToString(entries_[i]->GetPageID()));
-      temp.append("_");
-      if (entries_[i]->site_instance())
-        temp.append(base::IntToString(entries_[i]->site_instance()->GetId()));
-      else
-        temp.append("N");
-      if (entries_[i]->site_instance() != tab_contents_->GetSiteInstance())
-        temp.append("x");
-      temp.append(",");
-    }
-    GURL url(temp);
-    static_cast<RenderViewHostImpl*>(
-        tab_contents_->GetRenderViewHost())->Send(
-            new ViewMsg_TempCrashWithData(url));
-    return content::NAVIGATION_TYPE_NAV_IGNORE;
-  }
-  NavigationEntryImpl* existing_entry = entries_[existing_entry_index].get();
-
-  if (!content::PageTransitionIsMainFrame(params.transition)) {
-    // All manual subframes would get new IDs and were handled above, so we
-    // know this is auto. Since the current page was found in the navigation
-    // entry list, we're guaranteed to have a last committed entry.
-    DCHECK(GetLastCommittedEntry());
-    return content::NAVIGATION_TYPE_AUTO_SUBFRAME;
-  }
-
-  // Anything below here we know is a main frame navigation.
-  if (pending_entry_ &&
-      existing_entry != pending_entry_ &&
-      pending_entry_->GetPageID() == -1 &&
-      existing_entry == GetLastCommittedEntry()) {
-    // In this case, we have a pending entry for a URL but WebCore didn't do a
-    // new navigation. This happens when you press enter in the URL bar to
-    // reload. We will create a pending entry, but WebKit will convert it to
-    // a reload since it's the same page and not create a new entry for it
-    // (the user doesn't want to have a new back/forward entry when they do
-    // this). If this matches the last committed entry, we want to just ignore
-    // the pending entry and go back to where we were (the "existing entry").
-    return content::NAVIGATION_TYPE_SAME_PAGE;
-  }
-
-  // Any toplevel navigations with the same base (minus the reference fragment)
-  // are in-page navigations. We weeded out subframe navigations above. Most of
-  // the time this doesn't matter since WebKit doesn't tell us about subframe
-  // navigations that don't actually navigate, but it can happen when there is
-  // an encoding override (it always sends a navigation request).
-  if (AreURLsInPageNavigation(existing_entry->GetURL(), params.url))
-    return content::NAVIGATION_TYPE_IN_PAGE;
-
-  // Since we weeded out "new" navigations above, we know this is an existing
-  // (back/forward) navigation.
-  return content::NAVIGATION_TYPE_EXISTING_PAGE;
-}
-
-bool NavigationControllerImpl::IsRedirect(
-  const ViewHostMsg_FrameNavigate_Params& params) {
-  // For main frame transition, we judge by params.transition.
-  // Otherwise, by params.redirects.
-  if (content::PageTransitionIsMainFrame(params.transition)) {
-    return content::PageTransitionIsRedirect(params.transition);
-  }
-  return params.redirects.size() > 1;
-}
-
-void NavigationControllerImpl::RendererDidNavigateToNewPage(
-    const ViewHostMsg_FrameNavigate_Params& params, bool* did_replace_entry) {
-  NavigationEntryImpl* new_entry;
-  bool update_virtual_url;
-  if (pending_entry_) {
-    // TODO(brettw) this assumes that the pending entry is appropriate for the
-    // new page that was just loaded. I don't think this is necessarily the
-    // case! We should have some more tracking to know for sure.
-    new_entry = new NavigationEntryImpl(*pending_entry_);
-
-    // Don't use the page type from the pending entry. Some interstitial page
-    // may have set the type to interstitial. Once we commit, however, the page
-    // type must always be normal.
-    new_entry->set_page_type(content::PAGE_TYPE_NORMAL);
-    update_virtual_url = new_entry->update_virtual_url_with_url();
-  } else {
-    new_entry = new NavigationEntryImpl;
-    // When navigating to a new page, give the browser URL handler a chance to
-    // update the virtual URL based on the new URL. For example, this is needed
-    // to show chrome://bookmarks/#1 when the bookmarks webui extension changes
-    // the URL.
-    update_virtual_url = true;
-  }
-
-  new_entry->SetURL(params.url);
-  if (update_virtual_url)
-    UpdateVirtualURLToURL(new_entry, params.url);
-  new_entry->SetReferrer(params.referrer);
-  new_entry->SetPageID(params.page_id);
-  new_entry->SetTransitionType(params.transition);
-  new_entry->set_site_instance(
-      static_cast<SiteInstanceImpl*>(tab_contents_->GetSiteInstance()));
-  new_entry->SetHasPostData(params.is_post);
-  new_entry->SetPostID(params.post_id);
-
-  InsertOrReplaceEntry(new_entry, *did_replace_entry);
-}
-
-void NavigationControllerImpl::RendererDidNavigateToExistingPage(
-    const ViewHostMsg_FrameNavigate_Params& params) {
-  // We should only get here for main frame navigations.
-  DCHECK(content::PageTransitionIsMainFrame(params.transition));
-
-  // This is a back/forward navigation. The existing page for the ID is
-  // guaranteed to exist by ClassifyNavigation, and we just need to update it
-  // with new information from the renderer.
-  int entry_index = GetEntryIndexWithPageID(tab_contents_->GetSiteInstance(),
-                                            params.page_id);
-  DCHECK(entry_index >= 0 &&
-         entry_index < static_cast<int>(entries_.size()));
-  NavigationEntryImpl* entry = entries_[entry_index].get();
-
-  // The URL may have changed due to redirects. The site instance will normally
-  // be the same except during session restore, when no site instance will be
-  // assigned.
-  entry->SetURL(params.url);
-  if (entry->update_virtual_url_with_url())
-    UpdateVirtualURLToURL(entry, params.url);
-  DCHECK(entry->site_instance() == NULL ||
-         entry->site_instance() == tab_contents_->GetSiteInstance());
-  entry->set_site_instance(
-      static_cast<SiteInstanceImpl*>(tab_contents_->GetSiteInstance()));
-
-  entry->SetHasPostData(params.is_post);
-  entry->SetPostID(params.post_id);
-
-  // The entry we found in the list might be pending if the user hit
-  // back/forward/reload. This load should commit it (since it's already in the
-  // list, we can just discard the pending pointer).  We should also discard the
-  // pending entry if it corresponds to a different navigation, since that one
-  // is now likely canceled.  If it is not canceled, we will treat it as a new
-  // navigation when it arrives, which is also ok.
-  //
-  // Note that we need to use the "internal" version since we don't want to
-  // actually change any other state, just kill the pointer.
-  if (pending_entry_)
-    DiscardNonCommittedEntriesInternal();
-
-  // If a transient entry was removed, the indices might have changed, so we
-  // have to query the entry index again.
-  last_committed_entry_index_ =
-      GetEntryIndexWithPageID(tab_contents_->GetSiteInstance(), params.page_id);
-}
-
-void NavigationControllerImpl::RendererDidNavigateToSamePage(
-    const ViewHostMsg_FrameNavigate_Params& params) {
-  // This mode implies we have a pending entry that's the same as an existing
-  // entry for this page ID. This entry is guaranteed to exist by
-  // ClassifyNavigation. All we need to do is update the existing entry.
-  NavigationEntryImpl* existing_entry = GetEntryWithPageID(
-      tab_contents_->GetSiteInstance(), params.page_id);
-
-  // We assign the entry's unique ID to be that of the new one. Since this is
-  // always the result of a user action, we want to dismiss infobars, etc. like
-  // a regular user-initiated navigation.
-  existing_entry->set_unique_id(pending_entry_->GetUniqueID());
-
-  // The URL may have changed due to redirects.
-  if (existing_entry->update_virtual_url_with_url())
-    UpdateVirtualURLToURL(existing_entry, params.url);
-  existing_entry->SetURL(params.url);
-
-  DiscardNonCommittedEntries();
-}
-
-void NavigationControllerImpl::RendererDidNavigateInPage(
-    const ViewHostMsg_FrameNavigate_Params& params, bool* did_replace_entry) {
-  DCHECK(content::PageTransitionIsMainFrame(params.transition)) <<
-      "WebKit should only tell us about in-page navs for the main frame.";
-  // We're guaranteed to have an entry for this one.
-  NavigationEntryImpl* existing_entry = GetEntryWithPageID(
-      tab_contents_->GetSiteInstance(), params.page_id);
-
-  // Reference fragment navigation. We're guaranteed to have the last_committed
-  // entry and it will be the same page as the new navigation (minus the
-  // reference fragments, of course).  We'll update the URL of the existing
-  // entry without pruning the forward history.
-  existing_entry->SetURL(params.url);
-  if (existing_entry->update_virtual_url_with_url())
-    UpdateVirtualURLToURL(existing_entry, params.url);
-
-  // This replaces the existing entry since the page ID didn't change.
-  *did_replace_entry = true;
-
-  if (pending_entry_)
-    DiscardNonCommittedEntriesInternal();
-
-  // If a transient entry was removed, the indices might have changed, so we
-  // have to query the entry index again.
-  last_committed_entry_index_ =
-      GetEntryIndexWithPageID(tab_contents_->GetSiteInstance(), params.page_id);
-}
-
-void NavigationControllerImpl::RendererDidNavigateNewSubframe(
-    const ViewHostMsg_FrameNavigate_Params& params) {
-  if (content::PageTransitionStripQualifier(params.transition) ==
-      content::PAGE_TRANSITION_AUTO_SUBFRAME) {
-    // This is not user-initiated. Ignore.
-    return;
-  }
-
-  // Manual subframe navigations just get the current entry cloned so the user
-  // can go back or forward to it. The actual subframe information will be
-  // stored in the page state for each of those entries. This happens out of
-  // band with the actual navigations.
-  DCHECK(GetLastCommittedEntry()) << "ClassifyNavigation should guarantee "
-                                  << "that a last committed entry exists.";
-  NavigationEntryImpl* new_entry = new NavigationEntryImpl(
-      *NavigationEntryImpl::FromNavigationEntry(GetLastCommittedEntry()));
-  new_entry->SetPageID(params.page_id);
-  InsertOrReplaceEntry(new_entry, false);
-}
-
-bool NavigationControllerImpl::RendererDidNavigateAutoSubframe(
-    const ViewHostMsg_FrameNavigate_Params& params) {
-  // We're guaranteed to have a previously committed entry, and we now need to
-  // handle navigation inside of a subframe in it without creating a new entry.
-  DCHECK(GetLastCommittedEntry());
-
-  // Handle the case where we're navigating back/forward to a previous subframe
-  // navigation entry. This is case "2." in NAV_AUTO_SUBFRAME comment in the
-  // header file. In case "1." this will be a NOP.
-  int entry_index = GetEntryIndexWithPageID(
-      tab_contents_->GetSiteInstance(),
-      params.page_id);
-  if (entry_index < 0 ||
-      entry_index >= static_cast<int>(entries_.size())) {
-    NOTREACHED();
-    return false;
-  }
-
-  // Update the current navigation entry in case we're going back/forward.
-  if (entry_index != last_committed_entry_index_) {
-    last_committed_entry_index_ = entry_index;
-    return true;
-  }
-  return false;
-}
-
-int NavigationControllerImpl::GetIndexOfEntry(
-    const NavigationEntryImpl* entry) const {
-  const NavigationEntries::const_iterator i(std::find(
-      entries_.begin(),
-      entries_.end(),
-      entry));
-  return (i == entries_.end()) ? -1 : static_cast<int>(i - entries_.begin());
-}
-
-bool NavigationControllerImpl::IsURLInPageNavigation(const GURL& url) const {
-  NavigationEntry* last_committed = GetLastCommittedEntry();
-  if (!last_committed)
-    return false;
-  return AreURLsInPageNavigation(last_committed->GetURL(), url);
-}
-
-void NavigationControllerImpl::CopyStateFrom(
-    const NavigationController& temp) {
-  const NavigationControllerImpl& source =
-      static_cast<const NavigationControllerImpl&>(temp);
-  // Verify that we look new.
-  DCHECK(GetEntryCount() == 0 && !GetPendingEntry());
-
-  if (source.GetEntryCount() == 0)
-    return;  // Nothing new to do.
-
-  needs_reload_ = true;
-  InsertEntriesFrom(source, source.GetEntryCount());
-
-  session_storage_namespace_ = source.session_storage_namespace_->Clone();
-
-  FinishRestore(source.last_committed_entry_index_, false);
-
-  // Copy the max page id map from the old tab to the new tab.  This ensures
-  // that new and existing navigations in the tab's current SiteInstances
-  // are identified properly.
-  tab_contents_->CopyMaxPageIDsFrom(source.tab_contents());
-}
-
-void NavigationControllerImpl::CopyStateFromAndPrune(
-    NavigationController* temp) {
-  NavigationControllerImpl* source =
-      static_cast<NavigationControllerImpl*>(temp);
-  // The SiteInstance and page_id of the last committed entry needs to be
-  // remembered at this point, in case there is only one committed entry
-  // and it is pruned.  We use a scoped_refptr to ensure the SiteInstance
-  // can't be freed during this time period.
-  NavigationEntryImpl* last_committed =
-      NavigationEntryImpl::FromNavigationEntry(GetLastCommittedEntry());
-  scoped_refptr<SiteInstance> site_instance(
-      last_committed ? last_committed->site_instance() : NULL);
-  int32 minimum_page_id = last_committed ? last_committed->GetPageID() : -1;
-  int32 max_page_id = last_committed ?
-      tab_contents_->GetMaxPageIDForSiteInstance(site_instance.get()) : -1;
-
-  // This code is intended for use when the last entry is the active entry.
-  DCHECK(
-      (transient_entry_index_ != -1 &&
-       transient_entry_index_ == GetEntryCount() - 1) ||
-      (pending_entry_ && (pending_entry_index_ == -1 ||
-                          pending_entry_index_ == GetEntryCount() - 1)) ||
-      (!pending_entry_ && last_committed_entry_index_ == GetEntryCount() - 1));
-
-  // Remove all the entries leaving the active entry.
-  PruneAllButActive();
-
-  // We now have zero or one entries.  Ensure that adding the entries from
-  // source won't put us over the limit.
-  DCHECK(GetEntryCount() == 0 || GetEntryCount() == 1);
-  if (GetEntryCount() > 0)
-    source->PruneOldestEntryIfFull();
-
-  // Insert the entries from source. Don't use source->GetCurrentEntryIndex as
-  // we don't want to copy over the transient entry.
-  int max_source_index = source->pending_entry_index_ != -1 ?
-      source->pending_entry_index_ : source->last_committed_entry_index_;
-  if (max_source_index == -1)
-    max_source_index = source->GetEntryCount();
-  else
-    max_source_index++;
-  InsertEntriesFrom(*source, max_source_index);
-
-  // Adjust indices such that the last entry and pending are at the end now.
-  last_committed_entry_index_ = GetEntryCount() - 1;
-  if (pending_entry_index_ != -1)
-    pending_entry_index_ = GetEntryCount() - 1;
-  if (transient_entry_index_ != -1) {
-    // There's a transient entry. In this case we want the last committed to
-    // point to the previous entry.
-    transient_entry_index_ = GetEntryCount() - 1;
-    if (last_committed_entry_index_ != -1)
-      last_committed_entry_index_--;
-  }
-
-  tab_contents_->SetHistoryLengthAndPrune(site_instance.get(),
-                                          max_source_index,
-                                          minimum_page_id);
-
-  // Copy the max page id map from the old tab to the new tab.  This ensures
-  // that new and existing navigations in the tab's current SiteInstances
-  // are identified properly.
-  tab_contents_->CopyMaxPageIDsFrom(source->tab_contents());
-
-  // If there is a last committed entry, be sure to include it in the new
-  // max page ID map.
-  if (max_page_id > -1) {
-    tab_contents_->UpdateMaxPageIDForSiteInstance(site_instance.get(),
-                                                  max_page_id);
-  }
-}
-
-void NavigationControllerImpl::PruneAllButActive() {
-  if (transient_entry_index_ != -1) {
-    // There is a transient entry. Prune up to it.
-    DCHECK_EQ(GetEntryCount() - 1, transient_entry_index_);
-    entries_.erase(entries_.begin(), entries_.begin() + transient_entry_index_);
-    transient_entry_index_ = 0;
-    last_committed_entry_index_ = -1;
-    pending_entry_index_ = -1;
-  } else if (!pending_entry_) {
-    // There's no pending entry. Leave the last entry (if there is one).
-    if (!GetEntryCount())
-      return;
-
-    DCHECK(last_committed_entry_index_ >= 0);
-    entries_.erase(entries_.begin(),
-                   entries_.begin() + last_committed_entry_index_);
-    entries_.erase(entries_.begin() + 1, entries_.end());
-    last_committed_entry_index_ = 0;
-  } else if (pending_entry_index_ != -1) {
-    entries_.erase(entries_.begin(), entries_.begin() + pending_entry_index_);
-    entries_.erase(entries_.begin() + 1, entries_.end());
-    pending_entry_index_ = 0;
-    last_committed_entry_index_ = 0;
-  } else {
-    // There is a pending_entry, but it's not in entries_.
-    pending_entry_index_ = -1;
-    last_committed_entry_index_ = -1;
-    entries_.clear();
-  }
-
-  if (tab_contents_->GetInterstitialPage()) {
-    // Normally the interstitial page hides itself if the user doesn't proceeed.
-    // This would result in showing a NavigationEntry we just removed. Set this
-    // so the interstitial triggers a reload if the user doesn't proceed.
-    static_cast<InterstitialPageImpl*>(tab_contents_->GetInterstitialPage())->
-        set_reload_on_dont_proceed(true);
-  }
-}
-
-void NavigationControllerImpl::SetMaxRestoredPageID(int32 max_id) {
-  max_restored_page_id_ = max_id;
-}
-
-int32 NavigationControllerImpl::GetMaxRestoredPageID() const {
-  return max_restored_page_id_;
-}
-
-SessionStorageNamespace*
-    NavigationControllerImpl::GetSessionStorageNamespace() const {
-  return session_storage_namespace_;
-}
-
-bool NavigationControllerImpl::NeedsReload() const {
-  return needs_reload_;
-}
-
-void NavigationControllerImpl::RemoveEntryAtIndexInternal(int index) {
-  DCHECK(index < GetEntryCount());
-  DCHECK(index != last_committed_entry_index_);
-
-  DiscardNonCommittedEntries();
-
-  entries_.erase(entries_.begin() + index);
-  if (last_committed_entry_index_ > index)
-    last_committed_entry_index_--;
-}
-
-void NavigationControllerImpl::DiscardNonCommittedEntries() {
-  bool transient = transient_entry_index_ != -1;
-  DiscardNonCommittedEntriesInternal();
-
-  // If there was a transient entry, invalidate everything so the new active
-  // entry state is shown.
-  if (transient) {
-    tab_contents_->NotifyNavigationStateChanged(kInvalidateAll);
-  }
-}
-
-NavigationEntry* NavigationControllerImpl::GetPendingEntry() const {
-  return pending_entry_;
-}
-
-int NavigationControllerImpl::GetPendingEntryIndex() const {
-  return pending_entry_index_;
-}
-
-void NavigationControllerImpl::InsertOrReplaceEntry(NavigationEntryImpl* entry,
-                                                    bool replace) {
-  DCHECK(entry->GetTransitionType() != content::PAGE_TRANSITION_AUTO_SUBFRAME);
-
-  // Copy the pending entry's unique ID to the committed entry.
-  // I don't know if pending_entry_index_ can be other than -1 here.
-  const NavigationEntryImpl* const pending_entry =
-      (pending_entry_index_ == -1) ?
-          pending_entry_ : entries_[pending_entry_index_].get();
-  if (pending_entry)
-    entry->set_unique_id(pending_entry->GetUniqueID());
-
-  DiscardNonCommittedEntriesInternal();
-
-  int current_size = static_cast<int>(entries_.size());
-
-  if (current_size > 0) {
-    // Prune any entries which are in front of the current entry.
-    // Also prune the current entry if we are to replace the current entry.
-    // last_committed_entry_index_ must be updated here since calls to
-    // NotifyPrunedEntries() below may re-enter and we must make sure
-    // last_committed_entry_index_ is not left in an invalid state.
-    if (replace)
-      --last_committed_entry_index_;
-
-    int num_pruned = 0;
-    while (last_committed_entry_index_ < (current_size - 1)) {
-      num_pruned++;
-      entries_.pop_back();
-      current_size--;
-    }
-    if (num_pruned > 0)  // Only notify if we did prune something.
-      NotifyPrunedEntries(this, false, num_pruned);
-  }
-
-  PruneOldestEntryIfFull();
-
-  entries_.push_back(linked_ptr<NavigationEntryImpl>(entry));
-  last_committed_entry_index_ = static_cast<int>(entries_.size()) - 1;
-
-  // This is a new page ID, so we need everybody to know about it.
-  tab_contents_->UpdateMaxPageID(entry->GetPageID());
-}
-
-void NavigationControllerImpl::PruneOldestEntryIfFull() {
-  if (entries_.size() >= max_entry_count()) {
-    DCHECK_EQ(max_entry_count(), entries_.size());
-    DCHECK(last_committed_entry_index_ > 0);
-    RemoveEntryAtIndex(0);
-    NotifyPrunedEntries(this, true, 1);
-  }
-}
-
-void NavigationControllerImpl::NavigateToPendingEntry(ReloadType reload_type) {
-  needs_reload_ = false;
-
-  // If we were navigating to a slow-to-commit page, and the user performs
-  // a session history navigation to the last committed page, RenderViewHost
-  // will force the throbber to start, but WebKit will essentially ignore the
-  // navigation, and won't send a message to stop the throbber. To prevent this
-  // from happening, we drop the navigation here and stop the slow-to-commit
-  // page from loading (which would normally happen during the navigation).
-  if (pending_entry_index_ != -1 &&
-      pending_entry_index_ == last_committed_entry_index_ &&
-      (entries_[pending_entry_index_]->restore_type() ==
-          NavigationEntryImpl::RESTORE_NONE) &&
-      (entries_[pending_entry_index_]->GetTransitionType() &
-          content::PAGE_TRANSITION_FORWARD_BACK)) {
-    tab_contents_->Stop();
-
-    // If an interstitial page is showing, we want to close it to get back
-    // to what was showing before.
-    if (tab_contents_->GetInterstitialPage())
-      tab_contents_->GetInterstitialPage()->DontProceed();
-
-    DiscardNonCommittedEntries();
-    return;
-  }
-
-  // If an interstitial page is showing, the previous renderer is blocked and
-  // cannot make new requests.  Unblock (and disable) it to allow this
-  // navigation to succeed.  The interstitial will stay visible until the
-  // resulting DidNavigate.
-  if (tab_contents_->GetInterstitialPage()) {
-    static_cast<InterstitialPageImpl*>(tab_contents_->GetInterstitialPage())->
-        CancelForNavigation();
-  }
-
-  // For session history navigations only the pending_entry_index_ is set.
-  if (!pending_entry_) {
-    DCHECK_NE(pending_entry_index_, -1);
-    pending_entry_ = entries_[pending_entry_index_].get();
-  }
-
-  if (!tab_contents_->NavigateToPendingEntry(reload_type))
-    DiscardNonCommittedEntries();
-
-  // If the entry is being restored and doesn't have a SiteInstance yet, fill
-  // it in now that we know. This allows us to find the entry when it commits.
-  // This works for browser-initiated navigations. We handle renderer-initiated
-  // navigations to restored entries in TabContents::OnGoToEntryAtOffset.
-  if (pending_entry_ && !pending_entry_->site_instance() &&
-      pending_entry_->restore_type() != NavigationEntryImpl::RESTORE_NONE) {
-    pending_entry_->set_site_instance(static_cast<SiteInstanceImpl*>(
-        tab_contents_->GetPendingSiteInstance()));
-    pending_entry_->set_restore_type(NavigationEntryImpl::RESTORE_NONE);
-  }
-}
-
-void NavigationControllerImpl::NotifyNavigationEntryCommitted(
-    content::LoadCommittedDetails* details) {
-  details->entry = GetActiveEntry();
-  content::NotificationDetails notification_details =
-      content::Details<content::LoadCommittedDetails>(details);
-
-  // We need to notify the ssl_manager_ before the tab_contents_ so the
-  // location bar will have up-to-date information about the security style
-  // when it wants to draw.  See http://crbug.com/11157
-  ssl_manager_.DidCommitProvisionalLoad(notification_details);
-
-  // TODO(pkasting): http://b/1113079 Probably these explicit notification paths
-  // should be removed, and interested parties should just listen for the
-  // notification below instead.
-  tab_contents_->NotifyNavigationStateChanged(kInvalidateAll);
-
-  content::NotificationService::current()->Notify(
-      content::NOTIFICATION_NAV_ENTRY_COMMITTED,
-      content::Source<NavigationController>(this),
-      notification_details);
-}
-
-// static
-size_t NavigationControllerImpl::max_entry_count() {
-  if (max_entry_count_for_testing_ != kMaxEntryCountForTestingNotSet)
-     return max_entry_count_for_testing_;
-  return content::kMaxSessionHistoryEntries;
-}
-
-void NavigationControllerImpl::SetActive(bool is_active) {
-  if (is_active && needs_reload_)
-    LoadIfNecessary();
-}
-
-void NavigationControllerImpl::LoadIfNecessary() {
-  if (!needs_reload_)
-    return;
-
-  // Calling Reload() results in ignoring state, and not loading.
-  // Explicitly use NavigateToPendingEntry so that the renderer uses the
-  // cached state.
-  pending_entry_index_ = last_committed_entry_index_;
-  NavigateToPendingEntry(NO_RELOAD);
-}
-
-void NavigationControllerImpl::NotifyEntryChanged(const NavigationEntry* entry,
-                                                  int index) {
-  content::EntryChangedDetails det;
-  det.changed_entry = entry;
-  det.index = index;
-  content::NotificationService::current()->Notify(
-      content::NOTIFICATION_NAV_ENTRY_CHANGED,
-      content::Source<NavigationController>(this),
-      content::Details<content::EntryChangedDetails>(&det));
-}
-
-void NavigationControllerImpl::FinishRestore(int selected_index,
-                                             bool from_last_session) {
-  DCHECK(selected_index >= 0 && selected_index < GetEntryCount());
-  ConfigureEntriesForRestore(&entries_, from_last_session);
-
-  SetMaxRestoredPageID(static_cast<int32>(GetEntryCount()));
-
-  last_committed_entry_index_ = selected_index;
-}
-
-void NavigationControllerImpl::DiscardNonCommittedEntriesInternal() {
-  if (pending_entry_index_ == -1)
-    delete pending_entry_;
-  pending_entry_ = NULL;
-  pending_entry_index_ = -1;
-
-  DiscardTransientEntry();
-}
-
-void NavigationControllerImpl::DiscardTransientEntry() {
-  if (transient_entry_index_ == -1)
-    return;
-  entries_.erase(entries_.begin() + transient_entry_index_);
-  if (last_committed_entry_index_ > transient_entry_index_)
-    last_committed_entry_index_--;
-  transient_entry_index_ = -1;
-}
-
-int NavigationControllerImpl::GetEntryIndexWithPageID(
-    SiteInstance* instance, int32 page_id) const {
-  for (int i = static_cast<int>(entries_.size()) - 1; i >= 0; --i) {
-    if ((entries_[i]->site_instance() == instance) &&
-        (entries_[i]->GetPageID() == page_id))
-      return i;
-  }
-  return -1;
-}
-
-NavigationEntry* NavigationControllerImpl::GetTransientEntry() const {
-  if (transient_entry_index_ == -1)
-    return NULL;
-  return entries_[transient_entry_index_].get();
-}
-
-void NavigationControllerImpl::InsertEntriesFrom(
-    const NavigationControllerImpl& source,
-    int max_index) {
-  DCHECK_LE(max_index, source.GetEntryCount());
-  size_t insert_index = 0;
-  for (int i = 0; i < max_index; i++) {
-    // When cloning a tab, copy all entries except interstitial pages
-    if (source.entries_[i].get()->GetPageType() !=
-        content::PAGE_TYPE_INTERSTITIAL) {
-      entries_.insert(entries_.begin() + insert_index++,
-                      linked_ptr<NavigationEntryImpl>(
-                          new NavigationEntryImpl(*source.entries_[i])));
-    }
-  }
-}