events: Update scroll and touch handlers to not return EventResult.

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 30 matching lines @@
 
 ui::EventResult UserActivityDetector::OnMouseEvent(ui::MouseEvent* event) {
   VLOG_IF(1, ignore_next_mouse_event_) << "ignoring mouse event";
   if (!(event->flags() & ui::EF_IS_SYNTHESIZED) &&
       !ignore_next_mouse_event_)
     MaybeNotify();
   ignore_next_mouse_event_ = false;
   return ui::ER_UNHANDLED;
 }
 
-ui::EventResult UserActivityDetector::OnScrollEvent(ui::ScrollEvent* event) {
+void UserActivityDetector::OnScrollEvent(ui::ScrollEvent* event) {
   MaybeNotify();
-  return ui::ER_UNHANDLED;
 }
 
-ui::EventResult UserActivityDetector::OnTouchEvent(ui::TouchEvent* event) {
+void UserActivityDetector::OnTouchEvent(ui::TouchEvent* event) {
   MaybeNotify();
-  return ui::ER_UNHANDLED;
 }
 
 void UserActivityDetector::OnGestureEvent(ui::GestureEvent* event) {
   MaybeNotify();
 }
 
 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