mash: Move more shelf files to ash/common/shelf.

ash/common/system/status_area_layout_manager.h

Index: ash/common/system/status_area_layout_manager.h
diff --git a/ash/wm/status_area_layout_manager.h b/ash/common/system/status_area_layout_manager.h
similarity index 87%
rename from ash/wm/status_area_layout_manager.h
rename to ash/common/system/status_area_layout_manager.h
index 9d276ae5731205f3ed1e295d33c731093cb907ab..c4e705812703c01873dbe357ba767a12283304c2 100644
--- a/ash/wm/status_area_layout_manager.h
+++ b/ash/common/system/status_area_layout_manager.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_WM_STATUS_AREA_LAYOUT_MANAGER_H_
-#define ASH_WM_STATUS_AREA_LAYOUT_MANAGER_H_
+#ifndef ASH_COMMON_SYSTEM_STATUS_AREA_LAYOUT_MANAGER_H_
+#define ASH_COMMON_SYSTEM_STATUS_AREA_LAYOUT_MANAGER_H_
 
 #include "ash/common/wm/wm_snap_to_pixel_layout_manager.h"
 #include "base/macros.h"
@@ -41,4 +41,4 @@ class StatusAreaLayoutManager : public wm::WmSnapToPixelLayoutManager {
 
 }  // namespace ash
 
-#endif  // ASH_WM_STATUS_AREA_LAYOUT_MANAGER_H_
+#endif  // ASH_COMMON_SYSTEM_STATUS_AREA_LAYOUT_MANAGER_H_