Remove GestureEvent interface, and rename GestureEventImpl to GestureEvent.

ash/drag_drop/drag_drop_controller.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/drag_drop/drag_drop_controller.h"
 
 #include "ash/drag_drop/drag_image_view.h"
 #include "ash/shell.h"
 #include "ash/wm/cursor_manager.h"
 #include "base/message_loop.h"
@@ skipping 236 matching lines @@
       DragCancel();
       break;
     default:
       return ui::TOUCH_STATUS_UNKNOWN;
   }
   return ui::TOUCH_STATUS_CONTINUE;
 }
 
 ui::GestureStatus DragDropController::PreHandleGestureEvent(
     aura::Window* target,
-    ui::GestureEventImpl* event) {
+    ui::GestureEvent* event) {
   return ui::GESTURE_STATUS_UNKNOWN;
 }
 
 void DragDropController::OnWindowDestroyed(aura::Window* window) {
   if (drag_window_ == window) {
     drag_window_->RemoveObserver(this);
     drag_window_ = NULL;
   }
 }
 
@@ skipping 27 matching lines @@
 void DragDropController::Cleanup() {
   if (drag_window_)
     drag_window_->RemoveObserver(this);
   drag_window_ = NULL;
   drag_data_ = NULL;
   drag_drop_in_progress_ = false;
 }
 
 }  // namespace internal
 }  // namespace ash