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

ui/views/controls/button/custom_button.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_BUTTON_CUSTOM_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/events/event_constants.h"
@@ skipping 72 matching lines @@
   virtual std::string GetClassName() const OVERRIDE;
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseMoved(const ui::MouseEvent& event) OVERRIDE;
   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
   virtual bool OnKeyReleased(const ui::KeyEvent& event) OVERRIDE;
-  virtual ui::EventResult OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual void ShowContextMenu(const gfx::Point& p,
                                bool is_mouse_gesture) OVERRIDE;
   virtual void OnDragDone() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
   // Overridden from ui::AnimationDelegate:
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
   // Takes ownership of the delegate.
@@ skipping 59 matching lines @@
 protected:
   CustomButtonStateChangedDelegate() {}
 
 private:
   DISALLOW_COPY_AND_ASSIGN(CustomButtonStateChangedDelegate);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_