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

ash/wm/toplevel_window_event_handler.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_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
 #define ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
 
 #include <set>
 
 #include "ash/ash_export.h"
@@ skipping 22 matching lines @@
     : public ui::EventHandler,
       public aura::client::WindowMoveClient,
       public DisplayController::Observer {
  public:
   explicit ToplevelWindowEventHandler(aura::Window* owner);
   virtual ~ToplevelWindowEventHandler();
 
   // Overridden from ui::EventHandler:
   virtual ui::EventResult OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // Overridden form aura::client::WindowMoveClient:
   virtual aura::client::WindowMoveResult RunMoveLoop(
       aura::Window* source,
       const gfx::Vector2d& drag_offset) OVERRIDE;
   virtual void EndMoveLoop() OVERRIDE;
 
   // Overridden form ash::DisplayController::Observer:
   virtual void OnDisplayConfigurationChanging() OVERRIDE;
 
@@ skipping 51 matching lines @@
   // Used to track if this object is deleted while running a nested message
   // loop. If non-null the destructor sets this to true.
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(ToplevelWindowEventHandler);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_