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

ash/drag_drop/drag_drop_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_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 #define ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 47 matching lines @@
       int operation,
       ui::DragDropTypes::DragEventSource source) OVERRIDE;
   virtual void DragUpdate(aura::Window* target,
                           const ui::LocatedEvent& event) OVERRIDE;
   virtual void Drop(aura::Window* target,
                     const ui::LocatedEvent& event) OVERRIDE;
   virtual void DragCancel() OVERRIDE;
   virtual bool IsDragDropInProgress() OVERRIDE;
 
   // Overridden from ui::EventHandler:
-  virtual ui::EventResult OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
+  virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // Overridden from aura::WindowObserver.
   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
 
  protected:
   // Helper method to create a LinearAnimation object that will run the drag
   // cancel animation. Caller take ownership of the returned object. Protected
@@ skipping 57 matching lines @@
 
   base::WeakPtrFactory<DragDropController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DragDropController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_