[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/extension_host.h

Index: extensions/browser/extension_host.h
diff --git a/extensions/browser/extension_host.h b/extensions/browser/extension_host.h
index 846eb5087772d5ef8da11df04e6c10c3cb6ed8b3..d82c42775286e4d840400c6056071e04d1d7f694 100644
--- a/extensions/browser/extension_host.h
+++ b/extensions/browser/extension_host.h
@@ -151,7 +151,6 @@ class ExtensionHost : public DeferredStartRenderHost,
       DeferredStartRenderHostObserver* observer) override;
 
   // Message handlers.
-  void OnRequest(const ExtensionHostMsg_Request_Params& params);
   void OnEventAck(int event_id);
   void OnIncrementLazyKeepaliveCount();
   void OnDecrementLazyKeepaliveCount();
@@ -193,8 +192,6 @@ class ExtensionHost : public DeferredStartRenderHost,
   // 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_;