events: Update mouse-event handlers to not return EventResult.

ash/magnifier/partial_magnification_controller.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_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
 #define ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
 
 #include "ui/aura/window_observer.h"
 #include "ui/base/events/event_handler.h"
 #include "ui/gfx/point.h"
@@ skipping 49 matching lines @@
   // Create the magnifier window.
   void CreateMagnifierWindow();
 
   // Cleans up the window if needed.
   void CloseMagnifierWindow();
 
   // Removes this as an observer of the zoom widget and the root window.
   void RemoveZoomWidgetObservers();
 
   // ui::EventHandler overrides:
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
 
   // Overridden from WindowObserver:
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // Overridden from WidgetObserver:
   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
 
   // True if the magnified window is in motion of zooming or un-zooming effect.
   // Otherwise, false.
   bool is_on_zooming_;
 
   bool is_enabled_;
 
   // Current scale, origin (left-top) position of the magnification window.
   float scale_;
   gfx::Point origin_;
 
   views::Widget* zoom_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(PartialMagnificationController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_