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

chrome/browser/ui/webui/print_preview/print_preview_handler_unittest.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 "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/printing/background_printing_manager.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
 #include "chrome/browser/printing/print_preview_unit_test_base.h"
@@ skipping 49 matching lines @@
     ASSERT_TRUE(initiator_tab);
 
     printing::PrintPreviewTabController* controller =
         printing::PrintPreviewTabController::GetInstance();
     ASSERT_TRUE(controller);
 
     initiator_tab->print_view_manager()->PrintPreviewNow();
     preview_tab_ = controller->GetOrCreatePreviewTab(initiator_tab);
     ASSERT_TRUE(preview_tab_);
 
-    preview_ui_ =
-        static_cast<PrintPreviewUI*>(preview_tab_->web_contents()->GetWebUI());
+    preview_ui_ = static_cast<PrintPreviewUI*>(
+        preview_tab_->web_contents()->GetWebUI()->GetController());
     ASSERT_TRUE(preview_ui_);
   }
 
   void DeletePrintPreviewTab() {
     printing::BackgroundPrintingManager* bg_printing_manager =
         g_browser_process->background_printing_manager();
     ASSERT_TRUE(bg_printing_manager->HasPrintPreviewTab(preview_tab_));
 
     // Deleting TabContentsWrapper* to avoid warings from pref_notifier_impl.cc
     // after the test ends.
@@ skipping 170 matching lines @@
   double margin_value;
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginTop,
                                           &margin_value));
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginRight,
                                           &margin_value));
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginBottom,
                                           &margin_value));
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginLeft,
                                           &margin_value));
 }