Convert Aura to use ui::Event.

ash/event_rewriter_delegate.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_EVENT_REWRITER_DELEGATE_H_
 #define ASH_EVENT_REWRITER_DELEGATE_H_
 
-namespace aura {
+namespace ui {
 class KeyEvent;
 class LocatedEvent;
 }  // namespace aura
 
 namespace ash {
 
 // Delegate for rewriting or filtering an event.
 class EventRewriterDelegate {
  public:
   enum Action {
     ACTION_REWRITE_EVENT,
     ACTION_DROP_EVENT,
   };
 
   virtual ~EventRewriterDelegate() {}
 
   // A derived class can do either of the following:
   // 1) Just return ACTION_DROP_EVENT to drop the |event|.
   // 2) Rewrite the |event| and return ACTION_REWRITE_EVENT.
-  virtual Action RewriteOrFilterKeyEvent(aura::KeyEvent* event) = 0;
-  virtual Action RewriteOrFilterLocatedEvent(aura::LocatedEvent* event) = 0;
+  virtual Action RewriteOrFilterKeyEvent(ui::KeyEvent* event) = 0;
+  virtual Action RewriteOrFilterLocatedEvent(ui::LocatedEvent* event) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_EVENT_REWRITER_DELEGATE_H_