[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/app_window/app_window_contents.h

Index: extensions/browser/app_window/app_window_contents.h
diff --git a/extensions/browser/app_window/app_window_contents.h b/extensions/browser/app_window/app_window_contents.h
index ab07ca6a369ae6541971d0ed5e232daa33872e79..56c1664747369dcab562726ac1dc0c6787ad1aa9 100644
--- a/extensions/browser/app_window/app_window_contents.h
+++ b/extensions/browser/app_window/app_window_contents.h
@@ -10,7 +10,6 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "extensions/browser/app_window/app_window.h"
-#include "extensions/browser/extension_function_dispatcher.h"
 #include "url/gurl.h"
 
 namespace content {
@@ -25,8 +24,7 @@ struct DraggableRegion;
 // WebContents instance and observes it for the purpose of passing
 // messages to the extensions system.
 class AppWindowContentsImpl : public AppWindowContents,
-                              public content::WebContentsObserver,
-                              public ExtensionFunctionDispatcher::Delegate {
+                              public content::WebContentsObserver {
  public:
   explicit AppWindowContentsImpl(AppWindow* host);
   ~AppWindowContentsImpl() override;
@@ -38,23 +36,18 @@ class AppWindowContentsImpl : public AppWindowContents,
   void NativeWindowClosed() override;
   void DispatchWindowShownForTests() const override;
   content::WebContents* GetWebContents() const override;
+  WindowController* GetWindowController() const override;
 
  private:
   // content::WebContentsObserver
   bool OnMessageReceived(const IPC::Message& message) override;
 
-  // ExtensionFunctionDispatcher::Delegate
-  WindowController* GetExtensionWindowController() const override;
-  content::WebContents* GetAssociatedWebContents() const override;
-
-  void OnRequest(const ExtensionHostMsg_Request_Params& params);
   void UpdateDraggableRegions(const std::vector<DraggableRegion>& regions);
   void SuspendRenderViewHost(content::RenderViewHost* rvh);
 
   AppWindow* host_;  // This class is owned by |host_|
   GURL url_;
   scoped_ptr<content::WebContents> web_contents_;
-  scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindowContentsImpl);
 };