Remove GestureEvent interface, and rename GestureEventImpl to GestureEvent.

ash/touch/touch_observer_hud.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 "ash/touch/touch_observer_hud.h"
 
 #include "ash/shell_window_ids.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkPath.h"
@@ skipping 197 matching lines @@
   touch_labels_[event->touch_id()]->SetVisible(true);
   UpdateTouchPointLabel(event->touch_id());
 
   widget_->SetSize(widget_->GetContentsView()->GetPreferredSize());
 
   return ui::TOUCH_STATUS_UNKNOWN;
 }
 
 ui::GestureStatus TouchObserverHUD::PreHandleGestureEvent(
     aura::Window* target,
-    ui::GestureEventImpl* event) {
+    ui::GestureEvent* event) {
   return ui::GESTURE_STATUS_UNKNOWN;
 }
 
 void TouchObserverHUD::OnWidgetClosing(views::Widget* widget) {
   DCHECK_EQ(widget, widget_);
   widget_ = NULL;
 }
 
 }  // namespace internal
 }  // namespace ash