Move c/r/extensions/* into extensions namespace

chrome/renderer/extensions/event_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_EVENT_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_EVENT_BINDINGS_H_
 
-class ChromeV8Extension;
-class ExtensionDispatcher;
-
-namespace extensions {
-class EventFilter;
-}
-
 namespace v8 {
 class Extension;
 }
 
+namespace extensions {
+class ChromeV8Extension;
+class Dispatcher;
+class EventFilter;
+
 // This class deals with the javascript bindings related to Event objects.
 class EventBindings {
  public:
-  static ChromeV8Extension* Get(ExtensionDispatcher* dispatcher);
+  static ChromeV8Extension* Get(Dispatcher* dispatcher);
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_RENDERER_EXTENSIONS_EVENT_BINDINGS_H_