renderer/extensions: Forward declare a couple of v8 classes in EventBindings header.

chrome/renderer/extensions/event_bindings.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_RENDERER_EXTENSIONS_EVENT_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_EVENT_BINDINGS_H_
 #pragma once
 
 #include <string>
 
-#include "v8/include/v8.h"
-
 class ExtensionDispatcher;
 class GURL;
 class RenderThreadBase;
 class RenderView;
 
 namespace base {
 class ListValue;
 }
 
+namespace v8 {
+class Context;
+class Extension;
+template <class T> class Handle;
+}
+
 namespace WebKit {
 class WebFrame;
 }
 
 // This class deals with the javascript bindings related to Event objects.
 class EventBindings {
  public:
   static const char* kName;  // The v8::Extension name, for dependencies.
   static const char* kTestingExtensionId;
 
@@ skipping 17 matching lines @@
   // The called javascript function should not return a value other than
   // v8::Undefined(). A DCHECK is setup to break if it is otherwise.
   static void CallFunction(const std::string& extension_id,
                            const std::string& function_name,
                            const base::ListValue& arguments,
                            RenderView* render_view,
                            const GURL& event_url);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_EVENT_BINDINGS_H_