events: Change gesture-event handler in EventHandler to not return any values.

ash/wm/user_activity_detector.cc

 // Copyright (c) 2012 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.
 
 #include "ash/wm/user_activity_detector.h"
 
 #include "ash/wm/property_util.h"
 #include "ash/wm/user_activity_observer.h"
 #include "ui/base/events/event.h"
 
@@ skipping 40 matching lines @@
 ui::EventResult UserActivityDetector::OnScrollEvent(ui::ScrollEvent* event) {
   MaybeNotify();
   return ui::ER_UNHANDLED;
 }
 
 ui::EventResult UserActivityDetector::OnTouchEvent(ui::TouchEvent* event) {
   MaybeNotify();
   return ui::ER_UNHANDLED;
 }
 
-ui::EventResult UserActivityDetector::OnGestureEvent(ui::GestureEvent* event) {
+void UserActivityDetector::OnGestureEvent(ui::GestureEvent* event) {
   MaybeNotify();
-  return ui::ER_UNHANDLED;
 }
 
 void UserActivityDetector::MaybeNotify() {
   base::TimeTicks now =
       !now_for_test_.is_null() ? now_for_test_ : base::TimeTicks::Now();
   if (last_observer_notification_time_.is_null() ||
       (now - last_observer_notification_time_).InMillisecondsF() >=
       kNotifyIntervalMs) {
     FOR_EACH_OBSERVER(UserActivityObserver, observers_, OnUserActivity());
     last_observer_notification_time_ = now;
   }
 }
 
 }  // namespace ash