[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/extension_host.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_BROWSER_EXTENSION_HOST_H_
 #define EXTENSIONS_BROWSER_EXTENSION_HOST_H_
 
 #include <set>
 #include <string>
 
@@ skipping 133 matching lines @@
 
  private:
   // DeferredStartRenderHost:
   void CreateRenderViewNow() override;
   void AddDeferredStartRenderHostObserver(
       DeferredStartRenderHostObserver* observer) override;
   void RemoveDeferredStartRenderHostObserver(
       DeferredStartRenderHostObserver* observer) override;
 
   // Message handlers.
-  void OnRequest(const ExtensionHostMsg_Request_Params& params);
   void OnEventAck(int event_id);
   void OnIncrementLazyKeepaliveCount();
   void OnDecrementLazyKeepaliveCount();
 
   // Records UMA for load events.
   void RecordStopLoadingUMA();
 
   // Delegate for functionality that cannot exist in the extensions module.
   scoped_ptr<ExtensionHostDelegate> delegate_;
 
@@ skipping 21 matching lines @@
 
   // True if the main frame has finished parsing.
   bool document_element_available_;
 
   // The original URL of the page being hosted.
   GURL initial_url_;
 
   // Messages sent out to the renderer that have not been acknowledged yet.
   std::set<int> unacked_messages_;
 
-  ExtensionFunctionDispatcher extension_function_dispatcher_;
-
   // The type of view being hosted.
   ViewType extension_host_type_;
 
   // Measures how long since the ExtensionHost object was created. This can be
   // used to measure the responsiveness of UI. For example, it's important to
   // keep this as low as possible for popups. Contrast this to |load_start_|,
   // for which a low value does not necessarily mean a responsive UI, as
   // ExtensionHosts may sit in an ExtensionHostQueue for a long time.
   base::ElapsedTimer create_start_;
 
   // Measures how long since the initial URL started loading. This timer is
   // started only once the ExtensionHost has exited the ExtensionHostQueue.
   scoped_ptr<base::ElapsedTimer> load_start_;
 
   base::ObserverList<ExtensionHostObserver> observer_list_;
   base::ObserverList<DeferredStartRenderHostObserver>
       deferred_start_render_host_observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_HOST_H_