Move extensions bindings code out of //chrome

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"
-
-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_