Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/printing/print_preview_tab_controller.cc

 // Copyright (c) 2011 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/browser/printing/print_preview_tab_controller.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 23 matching lines @@
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "webkit/plugins/webplugininfo.h"
 
 namespace {
 
 void EnableInternalPDFPluginForTab(TabContentsWrapper* preview_tab) {
   // Always enable the internal PDF plugin for the print preview page.
   ChromePluginServiceFilter::GetInstance()->OverridePluginForTab(
-        preview_tab->render_view_host()->process()->GetID(),
-        preview_tab->render_view_host()->routing_id(),
+        preview_tab->tab_contents()->render_view_host()->process()->GetID(),
+        preview_tab->tab_contents()->render_view_host()->routing_id(),
         GURL(),
         ASCIIToUTF16(chrome::ChromeContentClient::kPDFPluginName));
 }
 
 class PrintPreviewTabDelegate : public HtmlDialogUIDelegate {
  public:
   explicit PrintPreviewTabDelegate(TabContentsWrapper* initiator_tab);
   virtual ~PrintPreviewTabDelegate();
 
   virtual bool IsDialogModal() const OVERRIDE;
@@ skipping 180 matching lines @@
 void PrintPreviewTabController::OnRendererProcessClosed(
     content::RenderProcessHost* rph) {
   // Store tabs in a vector and deal with them after iterating through
   // |preview_tab_map_| because RemoveFooTab() can change |preview_tab_map_|.
   std::vector<TabContentsWrapper*> closed_initiator_tabs;
   std::vector<TabContentsWrapper*> closed_preview_tabs;
   for (PrintPreviewTabMap::iterator iter = preview_tab_map_.begin();
        iter != preview_tab_map_.end(); ++iter) {
     TabContentsWrapper* preview_tab = iter->first;
     TabContentsWrapper* initiator_tab = iter->second;
-    if (preview_tab->render_view_host()->process() == rph) {
+    if (preview_tab->tab_contents()->render_view_host()->process() == rph) {
       closed_preview_tabs.push_back(preview_tab);
     } else if (initiator_tab &&
-               initiator_tab->render_view_host()->process() == rph) {
+               initiator_tab->tab_contents()->render_view_host()->process()
+                   == rph) {
       closed_initiator_tabs.push_back(initiator_tab);
     }
   }
 
   for (size_t i = 0; i < closed_preview_tabs.size(); ++i) {
     RemovePreviewTab(closed_preview_tabs[i]);
     PrintPreviewUI* print_preview_ui =
-        static_cast<PrintPreviewUI*>(closed_preview_tabs[i]->web_ui());
+        static_cast<PrintPreviewUI*>(
+            closed_preview_tabs[i]->tab_contents()->web_ui());
     if (print_preview_ui)
       print_preview_ui->OnPrintPreviewTabClosed();
   }
 
   for (size_t i = 0; i < closed_initiator_tabs.size(); ++i)
     RemoveInitiatorTab(closed_initiator_tabs[i], false);
 }
 
 void PrintPreviewTabController::OnTabContentsDestroyed(
     TabContentsWrapper* tab) {
@@ skipping 119 matching lines @@
 
   AddObservers(initiator_tab);
   AddObservers(preview_tab);
 
   return preview_tab;
 }
 
 void PrintPreviewTabController::SetInitiatorTabURLAndTitle(
     TabContentsWrapper* preview_tab) {
   TabContentsWrapper* initiator_tab = GetInitiatorTab(preview_tab);
-  if (initiator_tab && preview_tab->web_ui()) {
+  if (initiator_tab && preview_tab->tab_contents()->web_ui()) {
     PrintPreviewUI* print_preview_ui =
-        static_cast<PrintPreviewUI*>(preview_tab->web_ui());
+        static_cast<PrintPreviewUI*>(preview_tab->tab_contents()->web_ui());
     print_preview_ui->SetInitiatorTabURLAndTitle(
         initiator_tab->tab_contents()->GetURL().spec(),
         initiator_tab->print_view_manager()->RenderSourceName());
   }
 }
 
 void PrintPreviewTabController::AddObservers(TabContentsWrapper* tab) {
   TabContents* contents = tab->tab_contents();
   registrar_.Add(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
                  content::Source<TabContents>(contents));
   registrar_.Add(
       this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
       content::Source<NavigationController>(&contents->controller()));
 
   // Multiple sites may share the same RenderProcessHost, so check if this
   // notification has already been added.
-  content::RenderProcessHost* rph = tab->render_view_host()->process();
+  content::RenderProcessHost* rph =
+      tab->tab_contents()->render_view_host()->process();
   if (!registrar_.IsRegistered(this,
                                content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
                                content::Source<content::RenderProcessHost>(
                                   rph))) {
     registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
                    content::Source<content::RenderProcessHost>(rph));
   }
 }
 
 void PrintPreviewTabController::RemoveObservers(TabContentsWrapper* tab) {
   TabContents* contents = tab->tab_contents();
   registrar_.Remove(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
                     content::Source<TabContents>(contents));
   registrar_.Remove(
       this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
       content::Source<NavigationController>(&contents->controller()));
 
   // Multiple sites may share the same RenderProcessHost, so check if this
   // notification has already been added.
-  content::RenderProcessHost* rph = tab->render_view_host()->process();
+  content::RenderProcessHost* rph =
+      tab->tab_contents()->render_view_host()->process();
   if (registrar_.IsRegistered(this,
                               content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
                               content::Source<content::RenderProcessHost>(
                                   rph))) {
     registrar_.Remove(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
                       content::Source<content::RenderProcessHost>(rph));
   }
 }
 
 void PrintPreviewTabController::RemoveInitiatorTab(
     TabContentsWrapper* initiator_tab, bool is_navigation) {
   TabContentsWrapper* preview_tab = GetPrintPreviewForTab(initiator_tab);
   DCHECK(preview_tab);
   // Update the map entry first, so when the print preview tab gets destroyed
   // and reaches RemovePreviewTab(), it does not attempt to also remove the
   // initiator tab's observers.
   preview_tab_map_[preview_tab] = NULL;
   RemoveObservers(initiator_tab);
 
   // For the navigation case, PrintPreviewDone() has already been called in
   // PrintPreviewMessageHandler::NavigateToPendingEntry().
   if (!is_navigation)
     initiator_tab->print_view_manager()->PrintPreviewDone();
 
   // Initiator tab is closed. Close the print preview tab too.
   PrintPreviewUI* print_preview_ui =
-      static_cast<PrintPreviewUI*>(preview_tab->web_ui());
+      static_cast<PrintPreviewUI*>(preview_tab->tab_contents()->web_ui());
   if (print_preview_ui)
     print_preview_ui->OnInitiatorTabClosed();
 }
 
 void PrintPreviewTabController::RemovePreviewTab(
     TabContentsWrapper* preview_tab) {
   // Remove the initiator tab's observers before erasing the mapping.
   TabContentsWrapper* initiator_tab = GetInitiatorTab(preview_tab);
   if (initiator_tab) {
     RemoveObservers(initiator_tab);
     initiator_tab->print_view_manager()->PrintPreviewDone();
   }
 
   // Print preview TabContents is destroyed. Notify |PrintPreviewUI| to abort
   // the initiator tab preview request.
   PrintPreviewUI* print_preview_ui =
-      static_cast<PrintPreviewUI*>(preview_tab->web_ui());
+      static_cast<PrintPreviewUI*>(preview_tab->tab_contents()->web_ui());
   if (print_preview_ui)
     print_preview_ui->OnTabDestroyed();
 
   preview_tab_map_.erase(preview_tab);
   RemoveObservers(preview_tab);
 }
 
 }  // namespace printing