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

chrome/browser/ui/webui/print_preview/print_preview_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_
 #pragma once
 
 #include <string>
 
+#include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/time.h"
 #include "chrome/browser/printing/print_preview_data_service.h"
 #include "chrome/browser/ui/webui/constrained_html_ui.h"
 
 class PrintPreviewDataService;
 class PrintPreviewHandler;
 struct PrintHostMsg_DidGetPreviewPageCount_Params;
 
 namespace printing {
 struct PageSizeMargins;
 }
 
 class PrintPreviewUI : public ConstrainedHtmlUI {
  public:
-  explicit PrintPreviewUI(content::WebContents* contents);
+  explicit PrintPreviewUI(WebUI* web_ui);
   virtual ~PrintPreviewUI();
 
   // Gets the print preview |data|. |index| is zero-based, and can be
   // |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to get the entire preview
   // document.
   void GetPrintPreviewDataForIndex(int index,
                                    scoped_refptr<RefCountedBytes>* data);
 
   // Sets the print preview |data|. |index| is zero-based, and can be
   // |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to set the entire preview
@@ skipping 130 matching lines @@
   // Keeps track of whether OnClosePrintPreviewTab() has been called or not.
   bool tab_closed_;
 
   // True if the user visited the page directly, false if it's a live UI.
   bool is_dummy_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_