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 ea422991fb5c1f74b4d1f1bcca7d189fdba68844..ed0d19e894258619572840f81b9e0586da5cf208 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -158,8 +158,7 @@ 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 SetLayerTreeHostClientReadyOnImplThread();
   void SetVisibleOnImplThread(CompletionEvent* completion, bool visible);
   void HasInitializedOutputSurfaceOnImplThread(
@@ -221,8 +220,6 @@ 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_;
 
   // Set when the main thread is waiting on a ScheduledActionBeginFrame to be