Set the unique_event_id when converting from TouchEvent to WebTouchEvent

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 fac793598c9735336b2a52739c805a3f48b63245..cbe0ca76ea727f47f2e4c73847d865e0a13d1b4f 100644
--- a/ui/events/gestures/gesture_recognizer_impl_mac.cc
+++ b/ui/events/gestures/gesture_recognizer_impl_mac.cc
@@ -26,7 +26,7 @@ class GestureRecognizerImplMac : public GestureRecognizer {
                                GestureConsumer* consumer) override {
     return NULL;
   }
-  Gestures* AckSyncTouchEvent(const uint64 unique_event_id,
+  Gestures* AckSyncTouchEvent(const uint32 unique_touch_event_id,
                               ui::EventResult result,
                               GestureConsumer* consumer) override {
     return NULL;