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

ash/system/tray/tray_views.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/system/tray/tray_views.h"
 
 #include "ash/ash_constants.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_item_view.h"
 #include "base/i18n/rtl.h"
@@ skipping 164 matching lines @@
 
 void ActionableView::SetAccessibleName(const string16& name) {
   accessible_name_ = name;
 }
 
 void ActionableView::OnPaintFocusBorder(gfx::Canvas* canvas) {
   if (HasFocus() && (focusable() || IsAccessibilityFocusable()))
     DrawBorder(canvas, GetLocalBounds());
 }
 
-ui::EventResult ActionableView::OnGestureEvent(ui::GestureEvent* event) {
-  if (event->type() == ui::ET_GESTURE_TAP) {
-    return PerformAction(*event) ? ui::ER_CONSUMED :
-                                  ui::ER_UNHANDLED;
-  }
-  return ui::ER_UNHANDLED;
+void ActionableView::OnGestureEvent(ui::GestureEvent* event) {
+  if (event->type() == ui::ET_GESTURE_TAP && PerformAction(*event))
+    event->SetHandled();
 }
 
 void ActionableView::GetAccessibleState(ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_PUSHBUTTON;
   state->name = accessible_name_;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // HoverHighlightView
 
@@ skipping 526 matching lines @@
     tray_view->set_border(views::Border::CreateEmptyBorder(
         kTrayLabelItemVerticalPaddingVeriticalAlignment,
         horizontal_padding,
         kTrayLabelItemVerticalPaddingVeriticalAlignment,
         horizontal_padding));
   }
 }
 
 }  // namespace internal
 }  // namespace ash