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

ash/wm/app_list_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 ASH_WM_APP_LIST_CONTROLLER_H_
 #define ASH_WM_APP_LIST_CONTROLLER_H_
 
 #include "ash/launcher/launcher_icon_observer.h"
 #include "ash/shell_observer.h"
 #include "base/basictypes.h"
@@ skipping 58 matching lines @@
   // Starts show/hide animation.
   void ScheduleAnimation();
 
   void ProcessLocatedEvent(ui::LocatedEvent* event);
 
   // Makes app list bubble update its bounds.
   void UpdateBounds();
 
   // ui::EventHandler overrides:
   virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // aura::client::FocusChangeObserver overrides:
   virtual void OnWindowFocused(aura::Window* window) OVERRIDE;
 
   // aura::RootWindowObserver overrides:
   virtual void OnRootWindowResized(const aura::RootWindow* root,
                                    const gfx::Size& old_size) OVERRIDE;
 
   // ui::ImplicitAnimationObserver overrides:
   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
@@ skipping 26 matching lines @@
   // Whether should schedule snap back animation.
   bool should_snap_back_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_APP_LIST_CONTROLLER_H_