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

extensions/renderer/app_runtime_custom_bindings.h

 // Copyright 2014 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 EXTENSIONS_RENDERER_APP_RUNTIME_CUSTOM_BINDINGS_H_
 #define EXTENSIONS_RENDERER_APP_RUNTIME_CUSTOM_BINDINGS_H_
 
 #include "extensions/renderer/object_backed_native_handler.h"
 
 namespace extensions {
 
 // The native component of custom bindings for the chrome.app.runtime API.
 class AppRuntimeCustomBindings : public ObjectBackedNativeHandler {
  public:
   explicit AppRuntimeCustomBindings(ScriptContext* context);
 
  private:
+  void CreateBlob(const v8::FunctionCallbackInfo<v8::Value>& args);
+
   DISALLOW_COPY_AND_ASSIGN(AppRuntimeCustomBindings);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_APP_RUNTIME_CUSTOM_BINDINGS_H_