Remove the touch ack timeout handler out of the legacy touch event queue.

content/browser/renderer_host/input/touch_event_queue.h

Index: content/browser/renderer_host/input/touch_event_queue.h
diff --git a/content/browser/renderer_host/input/touch_event_queue.h b/content/browser/renderer_host/input/touch_event_queue.h
index 9384ee4379f26a0a179da0efe0383ee90edda258..c1c4115fa8570b143a698a593e133083fe3da8ab 100644
--- a/content/browser/renderer_host/input/touch_event_queue.h
+++ b/content/browser/renderer_host/input/touch_event_queue.h
@@ -112,7 +112,19 @@ class CONTENT_EXPORT TouchEventQueue {
 
   virtual bool Empty() const WARN_UNUSED_RESULT = 0;
 
+ protected:
+  virtual void SendTouchCancelEventForTouchEvent(
+      const TouchEventWithLatencyInfo& event_to_cancel) = 0;
+
+  // Empties the queue of touch events. This may result in any number of gesture
+  // events being sent to the renderer.
+  virtual void FlushQueue() = 0;
+  virtual void UpdateTouchConsumerStates(const blink::WebTouchEvent& event,
+                                         InputEventAckState ack_result) = 0;
+
  private:
+  friend class TouchTimeoutHandler;
+
   DISALLOW_COPY_AND_ASSIGN(TouchEventQueue);
 };