Allow MainThreadEventQueue to call the RenderWidget directly.

content/renderer/input/render_widget_input_handler_delegate.h

Index: content/renderer/input/render_widget_input_handler_delegate.h
diff --git a/content/renderer/input/render_widget_input_handler_delegate.h b/content/renderer/input/render_widget_input_handler_delegate.h
index f23ff3a1770cfd57a6aa39d5504f6bcd207a660f..4fef0b83ff070539c0ccca91abc87bef0b55dc21 100644
--- a/content/renderer/input/render_widget_input_handler_delegate.h
+++ b/content/renderer/input/render_widget_input_handler_delegate.h
@@ -53,13 +53,6 @@ class CONTENT_EXPORT RenderWidgetInputHandlerDelegate {
   virtual void OnInputEventAck(
       std::unique_ptr<InputEventAck> input_event_ack) = 0;
 
-  // Called when an event with a notify dispatch type
-  // (DISPATCH_TYPE_*_NOTIFY_MAIN) of |handled_type| has been processed
-  // by the main thread.
-  virtual void NotifyInputEventHandled(blink::WebInputEvent::Type handled_type,
-                                       blink::WebInputEventResult result,
-                                       InputEventAckState ack_result) = 0;
-
   // Notifies the delegate of the |input_handler| managing it.
   virtual void SetInputHandler(RenderWidgetInputHandler* input_handler) = 0;