Shuffles and renames ash/common/wm classes

ash/common/wm/wm_window_tracker.h

Index: ash/common/wm/wm_window_tracker.h
diff --git a/ash/common/wm/wm_window_tracker.h b/ash/common/wm/wm_window_tracker.h
deleted file mode 100644
index cb3840ce37bb80926765b576758cd8fcddd69cff..0000000000000000000000000000000000000000
--- a/ash/common/wm/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_COMMON_WM_WM_WINDOW_TRACKER_H_
-#define ASH_COMMON_WM_WM_WINDOW_TRACKER_H_
-
-#include "ash/common/wm/wm_window.h"
-#include "ash/common/wm/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_COMMON_WM_WM_WINDOW_TRACKER_H_