Move some more WM functionality down into ash.

ui/aura_shell/drag_drop_controller_unittest.cc

 // Copyright (c) 2011 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 "ui/aura_shell/drag_drop_controller.h"
 
+#include "ash/wm/root_window_event_filter.h"
 #include "base/location.h"
 #include "base/utf_string_conversions.h"
 #include "ui/aura/event.h"
 #include "ui/aura/root_window.h"
-#include "ui/aura_shell/root_window_event_filter.h"
 #include "ui/aura_shell/test/aura_shell_test_base.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/views/events/event.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace aura_shell {
 namespace test {
 
@@ skipping 401 matching lines @@
   EXPECT_EQ(num_drags_1 - 1 - drag_view->VerticalDragThreshold(),
       drag_view->num_drag_updates_);
   EXPECT_EQ(0, drag_view->num_drops_);
   EXPECT_EQ(0, drag_view->num_drag_exits_);
   EXPECT_TRUE(drag_view->drag_done_received_);
   delete widget;
 }
 
 }  // namespace test
 }  // namespace aura