[Extensions] Improve app custom bindings

chrome/renderer/extensions/app_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.
 
 // The AppObjectExtension is a v8 extension that creates an object
 // at window.chrome.app.  This object allows javascript to get details
 // on the app state of the page.
 // The read-only property app.isInstalled is true if the current page is
 // within the extent of an installed, enabled app.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_APP_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_APP_BINDINGS_H_
 
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/renderer/extensions/chrome_v8_extension_handler.h"
 #include "extensions/renderer/object_backed_native_handler.h"
-#include "third_party/WebKit/public/web/WebFrame.h"
+
+namespace blink {
+class WebLocalFrame;
+}
 
 namespace extensions {
 class Dispatcher;
 
 // Implements the chrome.app JavaScript object.
 //
 // TODO(aa): Add unit testing for this class.
 class AppBindings : public ObjectBackedNativeHandler,
                     public ChromeV8ExtensionHandler {
  public:
@@ skipping 15 matching lines @@
 
   // Dispatcher handle. Not owned.
   Dispatcher* dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AppBindings);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_APP_BINDINGS_H_