Convert Aura to use ui::Event.

ui/aura/bench/bench_main.cc

 // 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.
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/string_split.h"
 #include "base/time.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/aura/env.h"
-#include "ui/aura/event.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/single_display_manager.h"
 #include "ui/aura/shared/root_window_capture_client.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/debug_utils.h"
@@ skipping 315 matching lines @@
 #endif
 
   root_window->ShowRootWindow();
   MessageLoopForUI::current()->Run();
   root_window.reset();
 
   ui::CompositorTestSupport::Terminate();
 
   return 0;
 }