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

ui/views/controls/scrollbar/base_scroll_bar.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_SCROLLBAR_BASE_SCROLL_BAR_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_H_
 
 #include "ui/views/animation/scroll_animator.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/image_button.h"
@@ skipping 49 matching lines @@
   // View overrides:
   virtual gfx::Size GetPreferredSize() OVERRIDE = 0;
   virtual void Layout() OVERRIDE = 0;
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
   virtual bool OnMouseWheel(const ui::MouseWheelEvent& event) OVERRIDE;
 
   // ui::EventHandler overrides:
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // ScrollBar overrides:
   virtual void Update(int viewport_size,
                       int content_size,
                       int contents_scroll_offset) OVERRIDE;
   virtual int GetLayoutSize() const OVERRIDE = 0;
   virtual int GetPosition() const OVERRIDE;
 
   // ScrollDelegate overrides:
   virtual void OnScroll(float dx, float dy) OVERRIDE;
@@ skipping 82 matching lines @@
 
   scoped_ptr<MenuRunner> menu_runner_;
   scoped_ptr<ScrollAnimator> scroll_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseScrollBar);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_H_