Don't use PostTask queueing between compositor and main thread.

content/renderer/input/input_handler_manager.h

Index: content/renderer/input/input_handler_manager.h
diff --git a/content/renderer/input/input_handler_manager.h b/content/renderer/input/input_handler_manager.h
index 1935a2e04a363ca6e74861e14cce1d0ec193532b..07f564ed72dee2ab0cc808326ac0505d26d31294 100644
--- a/content/renderer/input/input_handler_manager.h
+++ b/content/renderer/input/input_handler_manager.h
@@ -111,10 +111,6 @@ class CONTENT_EXPORT InputHandlerManager {
       const blink::WebGestureEvent& gesture_event,
       const cc::InputHandlerScrollResult& scroll_result);
 
-  void NotifyInputEventHandledOnCompositorThread(int routing_id,
-                                                 blink::WebInputEvent::Type,
-                                                 InputEventAckState);
-
   typedef base::ScopedPtrHashMap<int,  // routing_id
                                  std::unique_ptr<InputHandlerWrapper>>
       InputHandlerMap;