Move compositor thread input handling logic into content

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 0bc1cf1b768dd7e534ade982e1326168a6a41549..32ba5ab2100770c16a2bd731ed07d5836d709920 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -153,8 +153,7 @@ class ThreadProxy : public Proxy,
   void BeginFrameAbortedOnImplThread();
   void RequestReadbackOnImplThread(ReadbackRequest* request);
   void FinishAllRenderingOnImplThread(CompletionEvent* completion);
-  void InitializeImplOnImplThread(CompletionEvent* completion,
-                                  InputHandlerClient* input_handler_client);
+  void InitializeImplOnImplThread(CompletionEvent* completion);
   void SetSurfaceReadyOnImplThread();
   void SetVisibleOnImplThread(CompletionEvent* completion, bool visible);
   void InitializeOutputSurfaceOnImplThread(
@@ -215,8 +214,6 @@ class ThreadProxy : public Proxy,
 
   scoped_ptr<LayerTreeHostImpl> layer_tree_host_impl_;
 
-  scoped_ptr<InputHandlerClient> input_handler_client_on_impl_thread_;
-
   scoped_ptr<Scheduler> scheduler_on_impl_thread_;
 
   // Holds on to the context we might use for compositing in between