Replace views::Event with ui::Event.

ui/views/examples/widget_example.h

 // Copyright (c) 2011 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_EXAMPLES_WIDGET_EXAMPLE_H_
 #define UI_VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 27 matching lines @@
 
   void InitWidget(Widget* widget, bool transparent);
 
 #if defined(OS_LINUX)
   void CreateChild(View* parent, bool transparent);
 #endif
 
   void CreatePopup(View* parent, bool transparent);
 
   // Overridden from ButtonListener:
-  virtual void ButtonPressed(Button* sender, const Event& event) OVERRIDE;
+  virtual void ButtonPressed(Button* sender, const ui::Event& event) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(WidgetExample);
 };
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_