Move most of ChromeV8Context to a base ScriptContext

chrome/renderer/extensions/render_view_observer_natives.h

 // Copyright 2013 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_RENDER_VIEW_OBSERVER_NATIVES_H_
 #define CHROME_RENDERER_EXTENSIONS_RENDER_VIEW_OBSERVER_NATIVES_H_
 
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
 #include "v8/include/v8.h"
 
-class ChromeV8Context;
-
 namespace extensions {
-
 class Dispatcher;
 
 // Native functions for JS to run callbacks upon RenderView events.
 class RenderViewObserverNatives : public ChromeV8Extension {
  public:
   RenderViewObserverNatives(Dispatcher* dispatcher, ChromeV8Context* context);
 
  private:
   // Runs a callback upon creation of new document element inside a render view
   // (document.documentElement).
   void OnDocumentElementCreated(
       const v8::FunctionCallbackInfo<v8::Value>& args);
   DISALLOW_COPY_AND_ASSIGN(RenderViewObserverNatives);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_RENDER_VIEW_OBSERVER_NATIVES_H_