blink:bindings: Passes the global context instead of |this| in JS.

chrome/renderer/extensions/media_galleries_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_MEDIA_GALLERIES_CUSTOM_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_MEDIA_GALLERIES_CUSTOM_BINDINGS_H_
 
 #include "extensions/renderer/object_backed_native_handler.h"
 
 namespace extensions {
 
 // Implements custom bindings for the media galleries API.
 class MediaGalleriesCustomBindings : public ObjectBackedNativeHandler {
  public:
   explicit MediaGalleriesCustomBindings(ScriptContext* context);
 
  private:
+  void GetMediaFileSystemObject(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
+
   DISALLOW_COPY_AND_ASSIGN(MediaGalleriesCustomBindings);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_MEDIA_GALLERIES_CUSTOM_BINDINGS_H_