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

ash/system/status_area_widget_delegate.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_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
 #define ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/gestures/shelf_gesture_handler.h"
 #include "ash/wm/shelf_types.h"
@@ skipping 25 matching lines @@
 
   // Overridden from views::AccessiblePaneView.
   virtual View* GetDefaultFocusableChild() OVERRIDE;
 
   // Overridden from views::View:
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual views::Widget* GetWidget() OVERRIDE;
   virtual const views::Widget* GetWidget() const OVERRIDE;
 
   // Overridden from ui::EventHandler:
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // views::WidgetDelegate overrides:
   virtual bool CanActivate() const OVERRIDE;
   virtual void DeleteDelegate() OVERRIDE;
 
  protected:
   // Overridden from views::View:
   virtual void ChildPreferredSizeChanged(View* child) OVERRIDE;
 
  private:
   void UpdateWidgetSize();
 
   const FocusCycler* focus_cycler_for_testing_;
   ShelfAlignment alignment_;
 
   ShelfGestureHandler gesture_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidgetDelegate);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_