Renames ash/wm/common into ash/common/wm

ash/wm/common/wm_window_tracker.h

Index: ash/wm/common/wm_window_tracker.h
diff --git a/ash/wm/common/wm_window_tracker.h b/ash/wm/common/wm_window_tracker.h
deleted file mode 100644
index 7909b07d3f3da0407959a47ba5faef213f2b4ad5..0000000000000000000000000000000000000000
--- a/ash/wm/common/wm_window_tracker.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2016 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.
-
-#ifndef ASH_WM_COMMON_WM_WINDOW_TRACKER_H_
-#define ASH_WM_COMMON_WM_WINDOW_TRACKER_H_
-
-#include "ash/wm/common/wm_window.h"
-#include "ash/wm/common/wm_window_observer.h"
-#include "ui/base/window_tracker_template.h"
-
-namespace ash {
-namespace wm {
-
-using WmWindowTracker = ui::WindowTrackerTemplate<WmWindow, WmWindowObserver>;
-
-}  // namespace wm
-}  // namespace ash
-
-#endif  // ASH_WM_COMMON_WM_WINDOW_TRACKER_H_