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

ui/aura/test/test_event_handler.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 "ui/aura/test/test_event_handler.h"
 
 namespace aura {
 namespace test {
 
 TestEventHandler::TestEventHandler()
@@ skipping 27 matching lines @@
 ui::EventResult TestEventHandler::OnScrollEvent(ui::ScrollEvent* event) {
   num_scroll_events_++;
   return ui::ER_UNHANDLED;
 }
 
 ui::EventResult TestEventHandler::OnTouchEvent(ui::TouchEvent* event) {
   num_touch_events_++;
   return ui::ER_UNHANDLED;
 }
 
-ui::EventResult TestEventHandler::OnGestureEvent(ui::GestureEvent* event) {
+void TestEventHandler::OnGestureEvent(ui::GestureEvent* event) {
   num_gesture_events_++;
-  return ui::ER_UNHANDLED;
 }
 
 }  // namespace test
 }  // namespace aura