Re-enable Eager Gesture Recognition on Aura

ui/events/gestures/gesture_recognizer_impl_mac.cc

Index: ui/events/gestures/gesture_recognizer_impl_mac.cc
diff --git a/ui/events/gestures/gesture_recognizer_impl_mac.cc b/ui/events/gestures/gesture_recognizer_impl_mac.cc
index a0d4ba45a9d16ebfa18a261165ce46051b7fd71f..345382a20bff23499117d51b2c388d976c4a8203 100644
--- a/ui/events/gestures/gesture_recognizer_impl_mac.cc
+++ b/ui/events/gestures/gesture_recognizer_impl_mac.cc
@@ -27,11 +27,7 @@ class GestureRecognizerImplMac : public GestureRecognizer {
                                           GestureConsumer* consumer) override {
     return NULL;
   }
-  Gestures* ProcessTouchEventOnAsyncAck(const TouchEvent& event,
-                                        ui::EventResult result,
-                                        GestureConsumer* consumer) override {
-    return NULL;
-  };
+  void IgnoreLastTouchEvent(GestureConsumer* consumer) override {}
   bool CleanupStateForConsumer(GestureConsumer* consumer) override {
     return false;
   }