mash: Move ash/common/wm/shelf to ash/common/shelf

ash/common/wm/shelf/wm_shelf_constants.cc

Index: ash/common/wm/shelf/wm_shelf_constants.cc
diff --git a/ash/common/wm/shelf/wm_shelf_constants.cc b/ash/common/wm/shelf/wm_shelf_constants.cc
deleted file mode 100644
index e393c26073777a48b0ff6f2fbd2693665c0dd8ed..0000000000000000000000000000000000000000
--- a/ash/common/wm/shelf/wm_shelf_constants.cc
+++ /dev/null
@@ -1,14 +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.
-
-#include "ash/common/wm/shelf/wm_shelf_constants.h"
-
-namespace ash {
-namespace wm {
-
-const int kShelfBackgroundAlpha = 204;
-const int kTimeToSwitchBackgroundMs = 1000;
-
-}  // namespace wm
-}  // namespace ash