Make WebUI objects not derive from WebUI. WebUI objects own the controller. This is the ownership...

chrome/browser/printing/print_preview_tab_controller.cc

 // 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 "chrome/browser/printing/print_preview_tab_controller.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 242 matching lines @@
     if (preview_tab->web_contents()->GetRenderProcessHost() == rph) {
       closed_preview_tabs.push_back(preview_tab);
     } else if (initiator_tab &&
                initiator_tab->web_contents()->GetRenderProcessHost() == 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_contents()->GetWebUI());
+    PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
+        closed_preview_tabs[i]->web_contents()->GetWebUI()->GetController());
     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 120 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_contents()->GetWebUI()) {
-    PrintPreviewUI* print_preview_ui =
-        static_cast<PrintPreviewUI*>(preview_tab->web_contents()->GetWebUI());
+    PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
+        preview_tab->web_contents()->GetWebUI()->GetController());
     print_preview_ui->SetInitiatorTabURLAndTitle(
         initiator_tab->web_contents()->GetURL().spec(),
         initiator_tab->print_view_manager()->RenderSourceName());
   }
 }
 
 void PrintPreviewTabController::AddObservers(TabContentsWrapper* tab) {
   WebContents* contents = tab->web_contents();
   registrar_.Add(this, content::NOTIFICATION_WEB_CONTENTS_DESTROYED,
                  content::Source<WebContents>(contents));
@@ skipping 42 matching lines @@
   // 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_contents()->GetWebUI());
+  PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
+      preview_tab->web_contents()->GetWebUI()->GetController());
   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_contents()->GetWebUI());
+  PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
+      preview_tab->web_contents()->GetWebUI()->GetController());
   if (print_preview_ui)
     print_preview_ui->OnTabDestroyed();
 
   preview_tab_map_.erase(preview_tab);
   RemoveObservers(preview_tab);
 }
 
 }  // namespace printing