Move WebUIMessageHandler to its own file in the public directory and put it in the content namesp...

chrome/browser/ui/webui/print_preview_handler.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_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_HANDLER_H_
 #pragma once
 
 #include <string>
 
+#include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "chrome/browser/printing/print_view_manager_observer.h"
 #include "chrome/browser/ui/select_file_dialog.h"
-#include "content/browser/webui/web_ui.h"
+#include "content/public/browser/web_ui_message_handler.h"
 #include "printing/print_job_constants.h"
 
 class FilePath;
 class PrintSystemTaskProxy;
 class TabContentsWrapper;
 
 namespace base {
 class DictionaryValue;
 class StringValue;
 }
 
 namespace printing {
 struct PageSizeMargins;
 class PrintBackend;
 }
 
 // The handler for Javascript messages related to the print preview dialog.
-class PrintPreviewHandler : public WebUIMessageHandler,
+class PrintPreviewHandler : public content::WebUIMessageHandler,
                             public base::SupportsWeakPtr<PrintPreviewHandler>,
                             public SelectFileDialog::Listener,
                             public printing::PrintViewManagerObserver {
  public:
   PrintPreviewHandler();
   virtual ~PrintPreviewHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
@@ skipping 161 matching lines @@
   bool has_logged_printers_count_;
 
   // Holds the path to the print to pdf request. It is empty if no such request
   // exists.
   scoped_ptr<FilePath> print_to_pdf_path_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_HANDLER_H_