Move root_window.* to window_event_dispatcher.*

ash/drag_drop/drag_drop_interactive_uitest.cc

 // Copyright (c) 2013 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/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
-#include "ui/aura/root_window.h"
+#include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/test/ui_controls.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace internal {
 namespace {
 
 class DraggableView : public views::View {
@@ skipping 133 matching lines @@
   base::MessageLoop::current()->Run();
 
   EXPECT_TRUE(target_view->dropped());
 
   source->Close();
   target->Close();
 }
 
 }  // namespace internal
 }  // namespace ash