Move c/r/extensions/* into extensions namespace

chrome/renderer/extensions/page_actions_custom_bindings.h

 // 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_PAGE_ACTIONS_CUSTOM_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_PAGE_ACTIONS_CUSTOM_BINDINGS_H_
 
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
 
-class ExtensionDispatcher;
-
 namespace extensions {
+class Dispatcher;
 
 // Implements custom bindings for the pageActions API.
 class PageActionsCustomBindings : public ChromeV8Extension {
  public:
-  explicit PageActionsCustomBindings(ExtensionDispatcher* extension_dispatcher);
+  explicit PageActionsCustomBindings(Dispatcher* extension_dispatcher);
 
  private:
   static v8::Handle<v8::Value> GetCurrentPageActions(const v8::Arguments& args);
 };
 
 }  // extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_PAGE_ACTIONS_CUSTOM_BINDINGS_H_