[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h

Index: extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
diff --git a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
index f95aab7837de94abe677aa76b74c6d36284e892e..33ff28ea3bf61d35e2e7fe73f0e5882163eca485 100644
--- a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
+++ b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
@@ -7,7 +7,6 @@
 
 #include "base/memory/weak_ptr.h"
 #include "components/guest_view/browser/guest_view.h"
-#include "extensions/browser/extension_function_dispatcher.h"
 
 namespace content {
 class WebContents;
@@ -50,18 +49,14 @@ class StreamContainer {
   base::WeakPtrFactory<StreamContainer> weak_factory_;
 };
 
-class MimeHandlerViewGuest : public guest_view::GuestView<MimeHandlerViewGuest>,
-                             public ExtensionFunctionDispatcher::Delegate {
+class MimeHandlerViewGuest :
+    public guest_view::GuestView<MimeHandlerViewGuest> {
  public:
   static guest_view::GuestViewBase* Create(
       content::WebContents* owner_web_contents);
 
   static const char Type[];
 
-  // ExtensionFunctionDispatcher::Delegate implementation.
-  WindowController* GetExtensionWindowController() const override;
-  content::WebContents* GetAssociatedWebContents() const override;
-
   // GuestViewBase implementation.
   const char* GetAPINamespace() const override;
   int GetTaskPrefix() const override;
@@ -96,7 +91,6 @@ class MimeHandlerViewGuest : public guest_view::GuestView<MimeHandlerViewGuest>,
 
   // content::WebContentsObserver implementation.
   void DocumentOnLoadCompletedInMainFrame() override;
-  bool OnMessageReceived(const IPC::Message& message) override;
 
   std::string view_id() const { return view_id_; }
   base::WeakPtr<StreamContainer> GetStream() const;
@@ -106,10 +100,7 @@ class MimeHandlerViewGuest : public guest_view::GuestView<MimeHandlerViewGuest>,
   ~MimeHandlerViewGuest() override;
 
  private:
-  void OnRequest(const ExtensionHostMsg_Request_Params& params);
-
   scoped_ptr<MimeHandlerViewGuestDelegate> delegate_;
-  scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
   scoped_ptr<StreamContainer> stream_;
   std::string view_id_;