Revert of [VSync Queue] Plug touch ack to gesture events and flush vsync queue if necessary

ui/events/gestures/gesture_provider_aura.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_
 #define UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 24 matching lines @@
  public:
   GestureProviderAura(GestureConsumer* consumer,
                       GestureProviderAuraClient* client);
   ~GestureProviderAura() override;
 
   void set_gesture_consumer(GestureConsumer* consumer) {
     gesture_consumer_ = consumer;
   }
 
   bool OnTouchEvent(TouchEvent* event);
-  void OnTouchEventAck(uint32_t unique_touch_event_id,
-                       bool event_consumed,
-                       bool is_source_touch_event_set_non_blocking);
+  void OnTouchEventAck(uint32_t unique_touch_event_id, bool event_consumed);
   const MotionEventAura& pointer_state() { return pointer_state_; }
   std::vector<std::unique_ptr<GestureEvent>> GetAndResetPendingGestures();
   void OnTouchEnter(int pointer_id, float x, float y);
 
   // GestureProviderClient implementation
   void OnGestureEvent(const GestureEventData& gesture) override;
 
  private:
   GestureProviderAuraClient* client_;
   MotionEventAura pointer_state_;
   FilteredGestureProvider filtered_gesture_provider_;
 
   bool handling_event_;
   std::vector<std::unique_ptr<GestureEvent>> pending_gestures_;
 
   // |gesture_consumer_| must outlive this object.
   GestureConsumer* gesture_consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureProviderAura);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_