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

ui/views/controls/menu/menu_controller.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_
 
 #include "build/build_config.h"
 
 #include <list>
@@ skipping 91 matching lines @@
   // NOTE: the coordinates of the events are in that of the
   // MenuScrollViewContainer.
   void OnMousePressed(SubmenuView* source, const ui::MouseEvent& event);
   void OnMouseDragged(SubmenuView* source, const ui::MouseEvent& event);
   void OnMouseReleased(SubmenuView* source, const ui::MouseEvent& event);
   void OnMouseMoved(SubmenuView* source, const ui::MouseEvent& event);
   void OnMouseEntered(SubmenuView* source, const ui::MouseEvent& event);
 #if defined(OS_LINUX)
   bool OnMouseWheel(SubmenuView* source, const ui::MouseWheelEvent& event);
 #endif
-  ui::EventResult OnGestureEvent(SubmenuView* source,
-                                 ui::GestureEvent* event);
+  void OnGestureEvent(SubmenuView* source, ui::GestureEvent* event);
 
   bool GetDropFormats(
       SubmenuView* source,
       int* formats,
       std::set<ui::OSExchangeData::CustomFormat>* custom_formats);
   bool AreDropTypesRequired(SubmenuView* source);
   bool CanDrop(SubmenuView* source, const ui::OSExchangeData& data);
   void OnDragEntered(SubmenuView* source, const ui::DropTargetEvent& event);
   int OnDragUpdated(SubmenuView* source, const ui::DropTargetEvent& event);
   void OnDragExited(SubmenuView* source);
@@ skipping 429 matching lines @@
   int message_loop_depth_;
 
   views::MenuConfig menu_config_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuController);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_H_