Componentize NetErrorHelperCore

chrome/renderer/net/net_error_helper_core.cc

Index: chrome/renderer/net/net_error_helper_core.cc
diff --git a/chrome/renderer/net/net_error_helper_core.cc b/chrome/renderer/net/net_error_helper_core.cc
deleted file mode 100644
index 94196295869d1bc75ac517632ed30728a763b4e6..0000000000000000000000000000000000000000
--- a/chrome/renderer/net/net_error_helper_core.cc
+++ /dev/null
@@ -1,948 +0,0 @@
-// Copyright 2013 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 "chrome/renderer/net/net_error_helper_core.h"
-
-#include <set>
-#include <string>
-#include <vector>
-
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/i18n/rtl.h"
-#include "base/json/json_reader.h"
-#include "base/json/json_value_converter.h"
-#include "base/json/json_writer.h"
-#include "base/location.h"
-#include "base/logging.h"
-#include "base/memory/scoped_vector.h"
-#include "base/metrics/histogram.h"
-#include "base/strings/string16.h"
-#include "base/strings/string_util.h"
-#include "base/values.h"
-#include "chrome/common/localized_error.h"
-#include "chrome/grit/generated_resources.h"
-#include "content/public/common/url_constants.h"
-#include "net/base/escape.h"
-#include "net/base/net_errors.h"
-#include "net/base/net_util.h"
-#include "third_party/WebKit/public/platform/WebString.h"
-#include "third_party/WebKit/public/platform/WebURLError.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "url/gurl.h"
-
-namespace {
-
-struct CorrectionTypeToResourceTable {
-  int resource_id;
-  const char* correction_type;
-};
-
-const CorrectionTypeToResourceTable kCorrectionResourceTable[] = {
-  {IDS_ERRORPAGES_SUGGESTION_VISIT_GOOGLE_CACHE, "cachedPage"},
-  // "reloadPage" is has special handling.
-  {IDS_ERRORPAGES_SUGGESTION_CORRECTED_URL, "urlCorrection"},
-  {IDS_ERRORPAGES_SUGGESTION_ALTERNATE_URL, "siteDomain"},
-  {IDS_ERRORPAGES_SUGGESTION_ALTERNATE_URL, "host"},
-  {IDS_ERRORPAGES_SUGGESTION_ALTERNATE_URL, "sitemap"},
-  {IDS_ERRORPAGES_SUGGESTION_ALTERNATE_URL, "pathParentFolder"},
-  // "siteSearchQuery" is not yet supported.
-  // TODO(mmenke):  Figure out what format "siteSearchQuery" uses for its
-  // suggestions.
-  // "webSearchQuery" has special handling.
-  {IDS_ERRORPAGES_SUGGESTION_ALTERNATE_URL, "contentOverlap"},
-  {IDS_ERRORPAGES_SUGGESTION_CORRECTED_URL, "emphasizedUrlCorrection"},
-};
-
-struct NavigationCorrection {
-  NavigationCorrection() : is_porn(false), is_soft_porn(false) {
-  }
-
-  static void RegisterJSONConverter(
-      base::JSONValueConverter<NavigationCorrection>* converter) {
-    converter->RegisterStringField("correctionType",
-                                   &NavigationCorrection::correction_type);
-    converter->RegisterStringField("urlCorrection",
-                                   &NavigationCorrection::url_correction);
-    converter->RegisterStringField("clickType",
-                                   &NavigationCorrection::click_type);
-    converter->RegisterStringField("clickData",
-                                   &NavigationCorrection::click_data);
-    converter->RegisterBoolField("isPorn", &NavigationCorrection::is_porn);
-    converter->RegisterBoolField("isSoftPorn",
-                                 &NavigationCorrection::is_soft_porn);
-  }
-
-  std::string correction_type;
-  std::string url_correction;
-  std::string click_type;
-  std::string click_data;
-  bool is_porn;
-  bool is_soft_porn;
-};
-
-struct NavigationCorrectionResponse {
-  std::string event_id;
-  std::string fingerprint;
-  ScopedVector<NavigationCorrection> corrections;
-
-  static void RegisterJSONConverter(
-      base::JSONValueConverter<NavigationCorrectionResponse>* converter) {
-    converter->RegisterStringField("result.eventId",
-                                   &NavigationCorrectionResponse::event_id);
-    converter->RegisterStringField("result.fingerprint",
-                                   &NavigationCorrectionResponse::fingerprint);
-    converter->RegisterRepeatedMessage(
-        "result.UrlCorrections",
-        &NavigationCorrectionResponse::corrections);
-  }
-};
-
-base::TimeDelta GetAutoReloadTime(size_t reload_count) {
-  static const int kDelaysMs[] = {
-    0, 5000, 30000, 60000, 300000, 600000, 1800000
-  };
-  if (reload_count >= arraysize(kDelaysMs))
-    reload_count = arraysize(kDelaysMs) - 1;
-  return base::TimeDelta::FromMilliseconds(kDelaysMs[reload_count]);
-}
-
-// Returns whether |net_error| is a DNS-related error (and therefore whether
-// the tab helper should start a DNS probe after receiving it.)
-bool IsDnsError(const blink::WebURLError& error) {
-  return error.domain.utf8() == net::kErrorDomain &&
-         (error.reason == net::ERR_NAME_NOT_RESOLVED ||
-          error.reason == net::ERR_NAME_RESOLUTION_FAILED);
-}
-
-GURL SanitizeURL(const GURL& url) {
-  GURL::Replacements remove_params;
-  remove_params.ClearUsername();
-  remove_params.ClearPassword();
-  remove_params.ClearQuery();
-  remove_params.ClearRef();
-  return url.ReplaceComponents(remove_params);
-}
-
-// Sanitizes and formats a URL for upload to the error correction service.
-std::string PrepareUrlForUpload(const GURL& url) {
-  // TODO(yuusuke): Change to net::FormatUrl when Link Doctor becomes
-  // unicode-capable.
-  std::string spec_to_send = SanitizeURL(url).spec();
-
-  // Notify navigation correction service of the url truncation by sending of
-  // "?" at the end.
-  if (url.has_query())
-    spec_to_send.append("?");
-  return spec_to_send;
-}
-
-// Given a WebURLError, returns true if the FixURL service should be used
-// for that error.  Also sets |error_param| to the string that should be sent to
-// the FixURL service to identify the error type.
-bool ShouldUseFixUrlServiceForError(const blink::WebURLError& error,
-                                    std::string* error_param) {
-  error_param->clear();
-
-  // Don't use the correction service for HTTPS (for privacy reasons).
-  GURL unreachable_url(error.unreachableURL);
-  if (GURL(unreachable_url).SchemeIsSecure())
-    return false;
-
-  std::string domain = error.domain.utf8();
-  if (domain == "http" && error.reason == 404) {
-    *error_param = "http404";
-    return true;
-  }
-  if (IsDnsError(error)) {
-    *error_param = "dnserror";
-    return true;
-  }
-  if (domain == net::kErrorDomain &&
-      (error.reason == net::ERR_CONNECTION_FAILED ||
-       error.reason == net::ERR_CONNECTION_REFUSED ||
-       error.reason == net::ERR_ADDRESS_UNREACHABLE ||
-       error.reason == net::ERR_CONNECTION_TIMED_OUT)) {
-    *error_param = "connectionFailure";
-    return true;
-  }
-  return false;
-}
-
-// Creates a request body for use with the fixurl service.  Sets parameters
-// shared by all types of requests to the service.  |correction_params| must
-// contain the parameters specific to the actual request type.
-std::string CreateRequestBody(
-    const std::string& method,
-    const std::string& error_param,
-    const NetErrorHelperCore::NavigationCorrectionParams& correction_params,
-    scoped_ptr<base::DictionaryValue> params_dict) {
-  // Set params common to all request types.
-  params_dict->SetString("key", correction_params.api_key);
-  params_dict->SetString("clientName", "chrome");
-  params_dict->SetString("error", error_param);
-
-  if (!correction_params.language.empty())
-    params_dict->SetString("language", correction_params.language);
-
-  if (!correction_params.country_code.empty())
-    params_dict->SetString("originCountry", correction_params.country_code);
-
-  base::DictionaryValue request_dict;
-  request_dict.SetString("method", method);
-  request_dict.SetString("apiVersion", "v1");
-  request_dict.Set("params", params_dict.release());
-
-  std::string request_body;
-  bool success = base::JSONWriter::Write(&request_dict, &request_body);
-  DCHECK(success);
-  return request_body;
-}
-
-// If URL correction information should be retrieved remotely for a main frame
-// load that failed with |error|, returns true and sets
-// |correction_request_body| to be the body for the correction request.
-std::string CreateFixUrlRequestBody(
-    const blink::WebURLError& error,
-    const NetErrorHelperCore::NavigationCorrectionParams& correction_params) {
-  std::string error_param;
-  bool result = ShouldUseFixUrlServiceForError(error, &error_param);
-  DCHECK(result);
-
-  // TODO(mmenke):  Investigate open sourcing the relevant protocol buffers and
-  //                using those directly instead.
-  scoped_ptr<base::DictionaryValue> params(new base::DictionaryValue());
-  params->SetString("urlQuery", PrepareUrlForUpload(error.unreachableURL));
-  return CreateRequestBody("linkdoctor.fixurl.fixurl", error_param,
-                           correction_params, params.Pass());
-}
-
-std::string CreateClickTrackingUrlRequestBody(
-    const blink::WebURLError& error,
-    const NetErrorHelperCore::NavigationCorrectionParams& correction_params,
-    const NavigationCorrectionResponse& response,
-    const NavigationCorrection& correction) {
-  std::string error_param;
-  bool result = ShouldUseFixUrlServiceForError(error, &error_param);
-  DCHECK(result);
-
-  scoped_ptr<base::DictionaryValue> params(new base::DictionaryValue());
-
-  params->SetString("originalUrlQuery",
-                    PrepareUrlForUpload(error.unreachableURL));
-
-  params->SetString("clickedUrlCorrection", correction.url_correction);
-  params->SetString("clickType", correction.click_type);
-  params->SetString("clickData", correction.click_data);
-
-  params->SetString("eventId", response.event_id);
-  params->SetString("fingerprint", response.fingerprint);
-
-  return CreateRequestBody("linkdoctor.fixurl.clicktracking", error_param,
-                           correction_params, params.Pass());
-}
-
-base::string16 FormatURLForDisplay(const GURL& url, bool is_rtl,
-                                   const std::string accept_languages) {
-  // Translate punycode into UTF8, unescape UTF8 URLs.
-  base::string16 url_for_display(net::FormatUrl(
-      url, accept_languages, net::kFormatUrlOmitNothing,
-      net::UnescapeRule::NORMAL, NULL, NULL, NULL));
-  // URLs are always LTR.
-  if (is_rtl)
-    base::i18n::WrapStringWithLTRFormatting(&url_for_display);
-  return url_for_display;
-}
-
-scoped_ptr<NavigationCorrectionResponse> ParseNavigationCorrectionResponse(
-    const std::string raw_response) {
-  // TODO(mmenke):  Open source related protocol buffers and use them directly.
-  scoped_ptr<base::Value> parsed(base::JSONReader::Read(raw_response));
-  scoped_ptr<NavigationCorrectionResponse> response(
-      new NavigationCorrectionResponse());
-  base::JSONValueConverter<NavigationCorrectionResponse> converter;
-  if (!parsed || !converter.Convert(*parsed, response.get()))
-    response.reset();
-  return response.Pass();
-}
-
-scoped_ptr<LocalizedError::ErrorPageParams> CreateErrorPageParams(
-    const NavigationCorrectionResponse& response,
-    const blink::WebURLError& error,
-    const NetErrorHelperCore::NavigationCorrectionParams& correction_params,
-    const std::string& accept_languages,
-    bool is_rtl) {
-  // Version of URL for display in suggestions.  It has to be sanitized first
-  // because any received suggestions will be relative to the sanitized URL.
-  base::string16 original_url_for_display =
-      FormatURLForDisplay(SanitizeURL(GURL(error.unreachableURL)), is_rtl,
-                          accept_languages);
-
-  scoped_ptr<LocalizedError::ErrorPageParams> params(
-      new LocalizedError::ErrorPageParams());
-  params->override_suggestions.reset(new base::ListValue());
-  scoped_ptr<base::ListValue> parsed_corrections(new base::ListValue());
-  for (ScopedVector<NavigationCorrection>::const_iterator it =
-           response.corrections.begin();
-       it != response.corrections.end(); ++it) {
-    // Doesn't seem like a good idea to show these.
-    if ((*it)->is_porn || (*it)->is_soft_porn)
-      continue;
-
-    int tracking_id = it - response.corrections.begin();
-
-    if ((*it)->correction_type == "reloadPage") {
-      params->suggest_reload = true;
-      params->reload_tracking_id = tracking_id;
-      continue;
-    }
-
-    if ((*it)->correction_type == "webSearchQuery") {
-      // If there are mutliple searches suggested, use the first suggestion.
-      if (params->search_terms.empty()) {
-        params->search_url = correction_params.search_url;
-        params->search_terms = (*it)->url_correction;
-        params->search_tracking_id = tracking_id;
-      }
-      continue;
-    }
-
-    // Allow reload page and web search query to be empty strings, but not
-    // links.
-    if ((*it)->url_correction.empty())
-      continue;
-    size_t correction_index;
-    for (correction_index = 0;
-         correction_index < arraysize(kCorrectionResourceTable);
-         ++correction_index) {
-      if ((*it)->correction_type !=
-              kCorrectionResourceTable[correction_index].correction_type) {
-        continue;
-      }
-      base::DictionaryValue* suggest = new base::DictionaryValue();
-      suggest->SetString("header",
-          l10n_util::GetStringUTF16(
-              kCorrectionResourceTable[correction_index].resource_id));
-      suggest->SetString("urlCorrection", (*it)->url_correction);
-      suggest->SetString(
-          "urlCorrectionForDisplay",
-          FormatURLForDisplay(GURL((*it)->url_correction), is_rtl,
-                              accept_languages));
-      suggest->SetString("originalUrlForDisplay", original_url_for_display);
-      suggest->SetInteger("trackingId", tracking_id);
-      params->override_suggestions->Append(suggest);
-      break;
-    }
-  }
-
-  if (params->override_suggestions->empty() && !params->search_url.is_valid())
-    params.reset();
-  return params.Pass();
-}
-
-void ReportAutoReloadSuccess(const blink::WebURLError& error, size_t count) {
-  if (error.domain.utf8() != net::kErrorDomain)
-    return;
-  UMA_HISTOGRAM_CUSTOM_ENUMERATION("Net.AutoReload.ErrorAtSuccess",
-                                   -error.reason,
-                                   net::GetAllErrorCodesForUma());
-  UMA_HISTOGRAM_COUNTS("Net.AutoReload.CountAtSuccess", count);
-  if (count == 1) {
-    UMA_HISTOGRAM_CUSTOM_ENUMERATION("Net.AutoReload.ErrorAtFirstSuccess",
-                                     -error.reason,
-                                     net::GetAllErrorCodesForUma());
-  }
-}
-
-void ReportAutoReloadFailure(const blink::WebURLError& error, size_t count) {
-  if (error.domain.utf8() != net::kErrorDomain)
-    return;
-  UMA_HISTOGRAM_CUSTOM_ENUMERATION("Net.AutoReload.ErrorAtStop",
-                                   -error.reason,
-                                   net::GetAllErrorCodesForUma());
-  UMA_HISTOGRAM_COUNTS("Net.AutoReload.CountAtStop", count);
-}
-
-}  // namespace
-
-struct NetErrorHelperCore::ErrorPageInfo {
-  ErrorPageInfo(blink::WebURLError error, bool was_failed_post)
-      : error(error),
-        was_failed_post(was_failed_post),
-        needs_dns_updates(false),
-        needs_load_navigation_corrections(false),
-        reload_button_in_page(false),
-        load_stale_button_in_page(false),
-        is_finished_loading(false),
-        auto_reload_triggered(false) {
-  }
-
-  // Information about the failed page load.
-  blink::WebURLError error;
-  bool was_failed_post;
-
-  // Information about the status of the error page.
-
-  // True if a page is a DNS error page and has not yet received a final DNS
-  // probe status.
-  bool needs_dns_updates;
-
-  // True if a blank page was loaded, and navigation corrections need to be
-  // loaded to generate the real error page.
-  bool needs_load_navigation_corrections;
-
-  // Navigation correction service paramers, which will be used in response to
-  // certain types of network errors.  They are all stored here in case they
-  // change over the course of displaying the error page.
-  scoped_ptr<NetErrorHelperCore::NavigationCorrectionParams>
-      navigation_correction_params;
-
-  scoped_ptr<NavigationCorrectionResponse> navigation_correction_response;
-
-  // All the navigation corrections that have been clicked, for tracking
-  // purposes.
-  std::set<int> clicked_corrections;
-
-  // Track if specific buttons are included in an error page, for statistics.
-  bool reload_button_in_page;
-  bool load_stale_button_in_page;
-
-  // True if a page has completed loading, at which point it can receive
-  // updates.
-  bool is_finished_loading;
-
-  // True if the auto-reload timer has fired and a reload is or has been in
-  // flight.
-  bool auto_reload_triggered;
-};
-
-NetErrorHelperCore::NavigationCorrectionParams::NavigationCorrectionParams() {
-}
-
-NetErrorHelperCore::NavigationCorrectionParams::~NavigationCorrectionParams() {
-}
-
-bool NetErrorHelperCore::IsReloadableError(
-    const NetErrorHelperCore::ErrorPageInfo& info) {
-  return info.error.domain.utf8() == net::kErrorDomain &&
-         info.error.reason != net::ERR_ABORTED &&
-         !info.was_failed_post;
-}
-
-NetErrorHelperCore::NetErrorHelperCore(Delegate* delegate,
-                                       bool auto_reload_enabled,
-                                       bool auto_reload_visible_only,
-                                       bool is_visible)
-    : delegate_(delegate),
-      last_probe_status_(chrome_common_net::DNS_PROBE_POSSIBLE),
-      auto_reload_enabled_(auto_reload_enabled),
-      auto_reload_visible_only_(auto_reload_visible_only),
-      auto_reload_timer_(new base::Timer(false, false)),
-      auto_reload_paused_(false),
-      uncommitted_load_started_(false),
-      // TODO(ellyjones): Make online_ accurate at object creation.
-      online_(true),
-      visible_(is_visible),
-      auto_reload_count_(0),
-      navigation_from_button_(NO_BUTTON) {
-}
-
-NetErrorHelperCore::~NetErrorHelperCore() {
-  if (committed_error_page_info_ &&
-      committed_error_page_info_->auto_reload_triggered) {
-    ReportAutoReloadFailure(committed_error_page_info_->error,
-                            auto_reload_count_);
-  }
-}
-
-void NetErrorHelperCore::CancelPendingFetches() {
-  // Cancel loading the alternate error page, and prevent any pending error page
-  // load from starting a new error page load.  Swapping in the error page when
-  // it's finished loading could abort the navigation, otherwise.
-  if (committed_error_page_info_)
-    committed_error_page_info_->needs_load_navigation_corrections = false;
-  if (pending_error_page_info_)
-    pending_error_page_info_->needs_load_navigation_corrections = false;
-  delegate_->CancelFetchNavigationCorrections();
-  auto_reload_timer_->Stop();
-  auto_reload_paused_ = false;
-}
-
-void NetErrorHelperCore::OnStop() {
-  if (committed_error_page_info_ &&
-      committed_error_page_info_->auto_reload_triggered) {
-    ReportAutoReloadFailure(committed_error_page_info_->error,
-                            auto_reload_count_);
-  }
-  CancelPendingFetches();
-  uncommitted_load_started_ = false;
-  auto_reload_count_ = 0;
-}
-
-void NetErrorHelperCore::OnWasShown() {
-  visible_ = true;
-  if (!auto_reload_visible_only_)
-    return;
-  if (auto_reload_paused_)
-    MaybeStartAutoReloadTimer();
-}
-
-void NetErrorHelperCore::OnWasHidden() {
-  visible_ = false;
-  if (!auto_reload_visible_only_)
-    return;
-  PauseAutoReloadTimer();
-}
-
-void NetErrorHelperCore::OnStartLoad(FrameType frame_type, PageType page_type) {
-  if (frame_type != MAIN_FRAME)
-    return;
-
-  uncommitted_load_started_ = true;
-
-  // If there's no pending error page information associated with the page load,
-  // or the new page is not an error page, then reset pending error page state.
-  if (!pending_error_page_info_ || page_type != ERROR_PAGE)
-    CancelPendingFetches();
-}
-
-void NetErrorHelperCore::OnCommitLoad(FrameType frame_type, const GURL& url) {
-  if (frame_type != MAIN_FRAME)
-    return;
-
-  // uncommitted_load_started_ could already be false, since RenderFrameImpl
-  // calls OnCommitLoad once for each in-page navigation (like a fragment
-  // change) with no corresponding OnStartLoad.
-  uncommitted_load_started_ = false;
-
-  // Track if an error occurred due to a page button press.
-  // This isn't perfect; if (for instance), the server is slow responding
-  // to a request generated from the page reload button, and the user hits
-  // the browser reload button, this code will still believe the
-  // result is from the page reload button.
-  if (committed_error_page_info_ && pending_error_page_info_ &&
-      navigation_from_button_ != NO_BUTTON &&
-      committed_error_page_info_->error.unreachableURL ==
-          pending_error_page_info_->error.unreachableURL) {
-    DCHECK(navigation_from_button_ == RELOAD_BUTTON ||
-           navigation_from_button_ == LOAD_STALE_BUTTON);
-    chrome_common_net::RecordEvent(
-        navigation_from_button_ == RELOAD_BUTTON ?
-            chrome_common_net::NETWORK_ERROR_PAGE_RELOAD_BUTTON_ERROR :
-            chrome_common_net::NETWORK_ERROR_PAGE_LOAD_STALE_BUTTON_ERROR);
-  }
-  navigation_from_button_ = NO_BUTTON;
-
-  if (committed_error_page_info_ && !pending_error_page_info_ &&
-      committed_error_page_info_->auto_reload_triggered) {
-    const blink::WebURLError& error = committed_error_page_info_->error;
-    const GURL& error_url = error.unreachableURL;
-    if (url == error_url)
-      ReportAutoReloadSuccess(error, auto_reload_count_);
-    else if (url != GURL(content::kUnreachableWebDataURL))
-      ReportAutoReloadFailure(error, auto_reload_count_);
-  }
-
-  committed_error_page_info_.reset(pending_error_page_info_.release());
-}
-
-void NetErrorHelperCore::OnFinishLoad(FrameType frame_type) {
-  if (frame_type != MAIN_FRAME)
-    return;
-
-  if (!committed_error_page_info_) {
-    auto_reload_count_ = 0;
-    return;
-  }
-
-  committed_error_page_info_->is_finished_loading = true;
-
-  chrome_common_net::RecordEvent(chrome_common_net::NETWORK_ERROR_PAGE_SHOWN);
-  if (committed_error_page_info_->reload_button_in_page) {
-    chrome_common_net::RecordEvent(
-        chrome_common_net::NETWORK_ERROR_PAGE_RELOAD_BUTTON_SHOWN);
-  }
-  if (committed_error_page_info_->load_stale_button_in_page) {
-    chrome_common_net::RecordEvent(
-        chrome_common_net::NETWORK_ERROR_PAGE_LOAD_STALE_BUTTON_SHOWN);
-  }
-
-  delegate_->EnablePageHelperFunctions();
-
-  if (committed_error_page_info_->needs_load_navigation_corrections) {
-    // If there is another pending error page load, |fix_url| should have been
-    // cleared.
-    DCHECK(!pending_error_page_info_);
-    DCHECK(!committed_error_page_info_->needs_dns_updates);
-    delegate_->FetchNavigationCorrections(
-        committed_error_page_info_->navigation_correction_params->url,
-        CreateFixUrlRequestBody(
-            committed_error_page_info_->error,
-            *committed_error_page_info_->navigation_correction_params));
-  } else if (auto_reload_enabled_ &&
-             IsReloadableError(*committed_error_page_info_)) {
-    MaybeStartAutoReloadTimer();
-  }
-
-  if (!committed_error_page_info_->needs_dns_updates ||
-      last_probe_status_ == chrome_common_net::DNS_PROBE_POSSIBLE) {
-    return;
-  }
-  DVLOG(1) << "Error page finished loading; sending saved status.";
-  UpdateErrorPage();
-}
-
-void NetErrorHelperCore::GetErrorHTML(
-    FrameType frame_type,
-    const blink::WebURLError& error,
-    bool is_failed_post,
-    std::string* error_html) {
-  if (frame_type == MAIN_FRAME) {
-    // If navigation corrections were needed before, that should have been
-    // cancelled earlier by starting a new page load (Which has now failed).
-    DCHECK(!committed_error_page_info_ ||
-           !committed_error_page_info_->needs_load_navigation_corrections);
-
-    pending_error_page_info_.reset(new ErrorPageInfo(error, is_failed_post));
-    pending_error_page_info_->navigation_correction_params.reset(
-        new NavigationCorrectionParams(navigation_correction_params_));
-    GetErrorHtmlForMainFrame(pending_error_page_info_.get(), error_html);
-  } else {
-    // These values do not matter, as error pages in iframes hide the buttons.
-    bool reload_button_in_page;
-    bool load_stale_button_in_page;
-
-    delegate_->GenerateLocalizedErrorPage(
-        error, is_failed_post, scoped_ptr<LocalizedError::ErrorPageParams>(),
-        &reload_button_in_page, &load_stale_button_in_page,
-        error_html);
-  }
-}
-
-void NetErrorHelperCore::OnNetErrorInfo(
-    chrome_common_net::DnsProbeStatus status) {
-  DCHECK_NE(chrome_common_net::DNS_PROBE_POSSIBLE, status);
-
-  last_probe_status_ = status;
-
-  if (!committed_error_page_info_ ||
-      !committed_error_page_info_->needs_dns_updates ||
-      !committed_error_page_info_->is_finished_loading) {
-    return;
-  }
-
-  UpdateErrorPage();
-}
-
-void NetErrorHelperCore::OnSetNavigationCorrectionInfo(
-    const GURL& navigation_correction_url,
-    const std::string& language,
-    const std::string& country_code,
-    const std::string& api_key,
-    const GURL& search_url) {
-  navigation_correction_params_.url = navigation_correction_url;
-  navigation_correction_params_.language = language;
-  navigation_correction_params_.country_code = country_code;
-  navigation_correction_params_.api_key = api_key;
-  navigation_correction_params_.search_url = search_url;
-}
-
-void NetErrorHelperCore::GetErrorHtmlForMainFrame(
-    ErrorPageInfo* pending_error_page_info,
-    std::string* error_html) {
-  std::string error_param;
-  blink::WebURLError error = pending_error_page_info->error;
-
-  if (pending_error_page_info->navigation_correction_params &&
-      pending_error_page_info->navigation_correction_params->url.is_valid() &&
-      ShouldUseFixUrlServiceForError(error, &error_param)) {
-    pending_error_page_info->needs_load_navigation_corrections = true;
-    return;
-  }
-
-  if (IsDnsError(pending_error_page_info->error)) {
-    // The last probe status needs to be reset if this is a DNS error.  This
-    // means that if a DNS error page is committed but has not yet finished
-    // loading, a DNS probe status scheduled to be sent to it may be thrown
-    // out, but since the new error page should trigger a new DNS probe, it
-    // will just get the results for the next page load.
-    last_probe_status_ = chrome_common_net::DNS_PROBE_POSSIBLE;
-    pending_error_page_info->needs_dns_updates = true;
-    error = GetUpdatedError(error);
-  }
-
-  delegate_->GenerateLocalizedErrorPage(
-      error, pending_error_page_info->was_failed_post,
-      scoped_ptr<LocalizedError::ErrorPageParams>(),
-      &pending_error_page_info->reload_button_in_page,
-      &pending_error_page_info->load_stale_button_in_page,
-      error_html);
-}
-
-void NetErrorHelperCore::UpdateErrorPage() {
-  DCHECK(committed_error_page_info_->needs_dns_updates);
-  DCHECK(committed_error_page_info_->is_finished_loading);
-  DCHECK_NE(chrome_common_net::DNS_PROBE_POSSIBLE, last_probe_status_);
-
-  UMA_HISTOGRAM_ENUMERATION("DnsProbe.ErrorPageUpdateStatus",
-                            last_probe_status_,
-                            chrome_common_net::DNS_PROBE_MAX);
-  // Every status other than DNS_PROBE_POSSIBLE and DNS_PROBE_STARTED is a
-  // final status code.  Once one is reached, the page does not need further
-  // updates.
-  if (last_probe_status_ != chrome_common_net::DNS_PROBE_STARTED)
-    committed_error_page_info_->needs_dns_updates = false;
-
-  // There is no need to worry about the button display statistics here because
-  // the presentation of the reload and load stale buttons can't be changed
-  // by a DNS error update.
-  delegate_->UpdateErrorPage(
-      GetUpdatedError(committed_error_page_info_->error),
-      committed_error_page_info_->was_failed_post);
-}
-
-void NetErrorHelperCore::OnNavigationCorrectionsFetched(
-    const std::string& corrections,
-    const std::string& accept_languages,
-    bool is_rtl) {
-  // Loading suggestions only starts when a blank error page finishes loading,
-  // and is cancelled with a new load.
-  DCHECK(!pending_error_page_info_);
-  DCHECK(committed_error_page_info_->is_finished_loading);
-  DCHECK(committed_error_page_info_->needs_load_navigation_corrections);
-  DCHECK(committed_error_page_info_->navigation_correction_params);
-
-  pending_error_page_info_.reset(
-      new ErrorPageInfo(committed_error_page_info_->error,
-                        committed_error_page_info_->was_failed_post));
-  pending_error_page_info_->navigation_correction_response =
-      ParseNavigationCorrectionResponse(corrections);
-
-  std::string error_html;
-  scoped_ptr<LocalizedError::ErrorPageParams> params;
-  if (pending_error_page_info_->navigation_correction_response) {
-    // Copy navigation correction parameters used for the request, so tracking
-    // requests can still be sent if the configuration changes.
-    pending_error_page_info_->navigation_correction_params.reset(
-        new NavigationCorrectionParams(
-            *committed_error_page_info_->navigation_correction_params));
-    params = CreateErrorPageParams(
-          *pending_error_page_info_->navigation_correction_response,
-          pending_error_page_info_->error,
-          *pending_error_page_info_->navigation_correction_params,
-          accept_languages, is_rtl);
-    delegate_->GenerateLocalizedErrorPage(
-        pending_error_page_info_->error,
-        pending_error_page_info_->was_failed_post,
-        params.Pass(),
-        &pending_error_page_info_->reload_button_in_page,
-        &pending_error_page_info_->load_stale_button_in_page,
-        &error_html);
-  } else {
-    // Since |navigation_correction_params| in |pending_error_page_info_| is
-    // NULL, this won't trigger another attempt to load corrections.
-    GetErrorHtmlForMainFrame(pending_error_page_info_.get(), &error_html);
-  }
-
-  // TODO(mmenke):  Once the new API is in place, look into replacing this
-  //                double page load by just updating the error page, like DNS
-  //                probes do.
-  delegate_->LoadErrorPageInMainFrame(
-      error_html,
-      pending_error_page_info_->error.unreachableURL);
-}
-
-blink::WebURLError NetErrorHelperCore::GetUpdatedError(
-    const blink::WebURLError& error) const {
-  // If a probe didn't run or wasn't conclusive, restore the original error.
-  if (last_probe_status_ == chrome_common_net::DNS_PROBE_NOT_RUN ||
-      last_probe_status_ ==
-          chrome_common_net::DNS_PROBE_FINISHED_INCONCLUSIVE) {
-    return error;
-  }
-
-  blink::WebURLError updated_error;
-  updated_error.domain = blink::WebString::fromUTF8(
-      chrome_common_net::kDnsProbeErrorDomain);
-  updated_error.reason = last_probe_status_;
-  updated_error.unreachableURL = error.unreachableURL;
-  updated_error.staleCopyInCache = error.staleCopyInCache;
-
-  return updated_error;
-}
-
-void NetErrorHelperCore::Reload() {
-  if (!committed_error_page_info_) {
-    return;
-  }
-  delegate_->ReloadPage();
-}
-
-bool NetErrorHelperCore::MaybeStartAutoReloadTimer() {
-  if (!committed_error_page_info_ ||
-      !committed_error_page_info_->is_finished_loading ||
-      pending_error_page_info_ ||
-      uncommitted_load_started_) {
-    return false;
-  }
-
-  StartAutoReloadTimer();
-  return true;
-}
-
-void NetErrorHelperCore::StartAutoReloadTimer() {
-  DCHECK(committed_error_page_info_);
-  DCHECK(IsReloadableError(*committed_error_page_info_));
-
-  committed_error_page_info_->auto_reload_triggered = true;
-
-  if (!online_ || (!visible_ && auto_reload_visible_only_)) {
-    auto_reload_paused_ = true;
-    return;
-  }
-
-  auto_reload_paused_ = false;
-  base::TimeDelta delay = GetAutoReloadTime(auto_reload_count_);
-  auto_reload_timer_->Stop();
-  auto_reload_timer_->Start(FROM_HERE, delay,
-      base::Bind(&NetErrorHelperCore::AutoReloadTimerFired,
-                 base::Unretained(this)));
-}
-
-void NetErrorHelperCore::AutoReloadTimerFired() {
-  auto_reload_count_++;
-  Reload();
-}
-
-void NetErrorHelperCore::PauseAutoReloadTimer() {
-  if (!auto_reload_timer_->IsRunning())
-    return;
-  DCHECK(committed_error_page_info_);
-  DCHECK(!auto_reload_paused_);
-  DCHECK(committed_error_page_info_->auto_reload_triggered);
-  auto_reload_timer_->Stop();
-  auto_reload_paused_ = true;
-}
-
-void NetErrorHelperCore::NetworkStateChanged(bool online) {
-  bool was_online = online_;
-  online_ = online;
-  if (!was_online && online) {
-    // Transitioning offline -> online
-    if (auto_reload_paused_)
-      MaybeStartAutoReloadTimer();
-  } else if (was_online && !online) {
-    // Transitioning online -> offline
-    if (auto_reload_timer_->IsRunning())
-      auto_reload_count_ = 0;
-    PauseAutoReloadTimer();
-  }
-}
-
-bool NetErrorHelperCore::ShouldSuppressErrorPage(FrameType frame_type,
-                                                 const GURL& url) {
-  // Don't suppress child frame errors.
-  if (frame_type != MAIN_FRAME)
-    return false;
-
-  if (!auto_reload_enabled_)
-    return false;
-
-  // If there's no committed error page, this error page wasn't from an auto
-  // reload.
-  if (!committed_error_page_info_)
-    return false;
-
-  // If the error page wasn't reloadable, display it.
-  if (!IsReloadableError(*committed_error_page_info_))
-    return false;
-
-  // If |auto_reload_timer_| is still running or is paused, this error page
-  // isn't from an auto reload.
-  if (auto_reload_timer_->IsRunning() || auto_reload_paused_)
-    return false;
-
-  // If the error page was reloadable, and the timer isn't running or paused, an
-  // auto-reload has already been triggered.
-  DCHECK(committed_error_page_info_->auto_reload_triggered);
-
-  GURL error_url = committed_error_page_info_->error.unreachableURL;
-  // TODO(ellyjones): also plumb the error code down to CCRC and check that
-  if (error_url != url)
-    return false;
-
-  // Suppressed an error-page load; the previous uncommitted load was the error
-  // page load starting, so forget about it.
-  uncommitted_load_started_ = false;
-
-  // The first iteration of the timer is started by OnFinishLoad calling
-  // MaybeStartAutoReloadTimer, but since error pages for subsequent loads are
-  // suppressed in this function, subsequent iterations of the timer have to be
-  // started here.
-  MaybeStartAutoReloadTimer();
-  return true;
-}
-
-void NetErrorHelperCore::ExecuteButtonPress(Button button) {
-  switch (button) {
-    case RELOAD_BUTTON:
-      chrome_common_net::RecordEvent(
-          chrome_common_net::NETWORK_ERROR_PAGE_RELOAD_BUTTON_CLICKED);
-      navigation_from_button_ = RELOAD_BUTTON;
-      Reload();
-      return;
-    case LOAD_STALE_BUTTON:
-      chrome_common_net::RecordEvent(
-          chrome_common_net::NETWORK_ERROR_PAGE_LOAD_STALE_BUTTON_CLICKED);
-      navigation_from_button_ = LOAD_STALE_BUTTON;
-      delegate_->LoadPageFromCache(
-          committed_error_page_info_->error.unreachableURL);
-      return;
-    case MORE_BUTTON:
-      // Visual effects on page are handled in Javascript code.
-      chrome_common_net::RecordEvent(
-          chrome_common_net::NETWORK_ERROR_PAGE_MORE_BUTTON_CLICKED);
-      return;
-    case NO_BUTTON:
-      NOTREACHED();
-      return;
-  }
-}
-
-void NetErrorHelperCore::TrackClick(int tracking_id) {
-  // It's technically possible for |navigation_correction_params| to be NULL but
-  // for |navigation_correction_response| not to be NULL, if the paramters
-  // changed between loading the original error page and loading the error page
-  if (!committed_error_page_info_ ||
-      !committed_error_page_info_->navigation_correction_response) {
-    return;
-  }
-
-  NavigationCorrectionResponse* response =
-      committed_error_page_info_->navigation_correction_response.get();
-
-  // |tracking_id| is less than 0 when the error page was not generated by the
-  // navigation correction service.  |tracking_id| should never be greater than
-  // the array size, but best to be safe, since it contains data from a remote
-  // site, though none of that data should make it into Javascript callbacks.
-  if (tracking_id < 0 ||
-      static_cast<size_t>(tracking_id) >= response->corrections.size()) {
-    return;
-  }
-
-  // Only report a clicked link once.
-  if (committed_error_page_info_->clicked_corrections.count(tracking_id))
-    return;
-
-  committed_error_page_info_->clicked_corrections.insert(tracking_id);
-  std::string request_body = CreateClickTrackingUrlRequestBody(
-      committed_error_page_info_->error,
-      *committed_error_page_info_->navigation_correction_params,
-      *response,
-      *response->corrections[tracking_id]);
-  delegate_->SendTrackingRequest(
-      committed_error_page_info_->navigation_correction_params->url,
-      request_body);
-}
-