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

ui/views/widget/widget.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_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
@@ skipping 641 matching lines @@
   virtual bool HasFocusManager() const OVERRIDE;
   virtual bool OnNativeWidgetPaintAccelerated(
       const gfx::Rect& dirty_region) OVERRIDE;
   virtual void OnNativeWidgetPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual int GetNonClientComponent(const gfx::Point& point) OVERRIDE;
   virtual bool OnKeyEvent(const ui::KeyEvent& event) OVERRIDE;
   virtual bool OnMouseEvent(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual ui::EventResult OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
   virtual ui::EventResult OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
   virtual bool ExecuteCommand(int command_id) OVERRIDE;
   virtual InputMethod* GetInputMethodDirect() OVERRIDE;
   virtual const std::vector<ui::Layer*>& GetRootLayers() OVERRIDE;
   virtual bool HasHitTestMask() const OVERRIDE;
   virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE;
   virtual Widget* AsWidget() OVERRIDE;
   virtual const Widget* AsWidget() const OVERRIDE;
 
   // Overridden from FocusTraversable:
   virtual FocusSearch* GetFocusSearch() OVERRIDE;
@@ skipping 138 matching lines @@
 
   // Is |root_layers_| out of date?
   bool root_layers_dirty_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_