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

ui/chromeos/touch_exploration_controller.cc

Index: ui/chromeos/touch_exploration_controller.cc
diff --git a/ui/chromeos/touch_exploration_controller.cc b/ui/chromeos/touch_exploration_controller.cc
index bd0473c6d5db32326eedd59113d65fd011eb9eb4..c756b0a00543de69c3d6f4706118970b726fa3f4 100644
--- a/ui/chromeos/touch_exploration_controller.cc
+++ b/ui/chromeos/touch_exploration_controller.cc
@@ -197,9 +197,8 @@
   if (gesture_provider_.get()) {
     ui::TouchEvent mutable_touch_event = touch_event;
     if (gesture_provider_->OnTouchEvent(&mutable_touch_event)) {
-      gesture_provider_->OnTouchEventAck(
-          mutable_touch_event.unique_event_id(), false /* event_consumed */,
-          false /* is_source_touch_event_set_non_blocking */);
+      gesture_provider_->OnTouchEventAck(mutable_touch_event.unique_event_id(),
+                                         false);
     }
     ProcessGestureEvents();
   }