Remove TouchEvent interface, and rename TouchEventImpl to TouchEvent

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 214 matching lines @@
       // We could also reach here because RootWindow may sometimes generate a
       // bunch of fake mouse events
       // (aura::RootWindow::PostMouseMoveEventAfterWindowChange).
       break;
   }
   return true;
 }
 
 ui::TouchStatus DragDropController::PreHandleTouchEvent(
     aura::Window* target,
-    ui::TouchEventImpl* event) {
+    ui::TouchEvent* event) {
   // TODO(sad): Also check for the touch-id.
   if (!drag_drop_in_progress_)
     return ui::TOUCH_STATUS_UNKNOWN;
   switch (event->type()) {
     case ui::ET_TOUCH_MOVED:
       DragUpdate(target, *event);
       break;
     case ui::ET_TOUCH_RELEASED:
       Drop(target, *event);
       break;
@@ skipping 49 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