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

chrome/browser/printing/print_view_manager.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_view_manager.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 87 matching lines @@
       PrintPreviewTabController::GetInstance();
   if (!tab_controller)
     return false;
   TabContentsWrapper* print_preview_tab =
       tab_controller->GetPrintPreviewForTab(tab_);
   if (print_preview_tab) {
     // Preview tab exist for current tab or current tab is preview tab.
     if (!print_preview_tab->web_contents()->GetWebUI())
       return false;
     PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
-        print_preview_tab->web_contents()->GetWebUI());
+        print_preview_tab->web_contents()->GetWebUI()->GetController());
     print_preview_ui->OnShowSystemDialog();
     return true;
   } else {
     return PrintNow();
   }
 }
 
 bool PrintViewManager::PrintPreviewNow() {
   if (print_preview_state_ != NOT_PREVIEWING) {
     NOTREACHED();
@@ skipping 475 matching lines @@
 }
 
 bool PrintViewManager::PrintNowInternal(IPC::Message* message) {
   // Don't print / print preview interstitials.
   if (web_contents()->ShowingInterstitialPage())
     return false;
   return Send(message);
 }
 
 }  // namespace printing