[Extensions] Clean up the handling of ExtensionHostMsg_Request

apps/custom_launcher_page_contents.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 APPS_CUSTOM_LAUNCHER_PAGE_CONTENTS_H_
 #define APPS_CUSTOM_LAUNCHER_PAGE_CONTENTS_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/web_contents_delegate.h"
-#include "content/public/browser/web_contents_observer.h"
-#include "extensions/browser/extension_function_dispatcher.h"
 
 class GURL;
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 class AppDelegate;
 class AppWebContentsHelper;
 }
 
 namespace apps {
 
 // Manages the web contents for extension-hosted launcher pages. The
 // implementation for this class should create and maintain the WebContents for
 // the page, and handle any message passing between the web contents and the
 // extension system.
-class CustomLauncherPageContents
-    : public content::WebContentsDelegate,
-      public content::WebContentsObserver,
-      public extensions::ExtensionFunctionDispatcher::Delegate {
+class CustomLauncherPageContents : public content::WebContentsDelegate {
  public:
   CustomLauncherPageContents(scoped_ptr<extensions::AppDelegate> app_delegate,
                              const std::string& extension_id);
   ~CustomLauncherPageContents() override;
 
   // Called to initialize and load the WebContents.
   void Initialize(content::BrowserContext* context, const GURL& url);
 
   content::WebContents* web_contents() const { return web_contents_.get(); }
 
@@ skipping 22 matching lines @@
                           bool last_unlocked_by_target) override;
   void RequestMediaAccessPermission(
       content::WebContents* web_contents,
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback) override;
   bool CheckMediaAccessPermission(content::WebContents* web_contents,
                                   const GURL& security_origin,
                                   content::MediaStreamType type) override;
 
  private:
-  // content::WebContentsObserver overrides:
-  bool OnMessageReceived(const IPC::Message& message) override;
-
-  // extensions::ExtensionFunctionDispatcher::Delegate overrides:
-  extensions::WindowController* GetExtensionWindowController() const override;
-  content::WebContents* GetAssociatedWebContents() const override;
-
-  void OnRequest(const ExtensionHostMsg_Request_Params& params);
-
   scoped_ptr<content::WebContents> web_contents_;
-  scoped_ptr<extensions::ExtensionFunctionDispatcher>
-      extension_function_dispatcher_;
   scoped_ptr<extensions::AppDelegate> app_delegate_;
   scoped_ptr<extensions::AppWebContentsHelper> helper_;
 
   std::string extension_id_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomLauncherPageContents);
 };
 
 }  // namespace apps
 
 #endif  // APPS_CUSTOM_LAUNCHER_PAGE_CONTENTS_H_