mash: Move ash_switches.* to ash/common; cleanup DEPS.

ash/common/ash_switches.h

 // Copyright (c) 2012 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_ASH_SWITCHES_H_
-#define ASH_ASH_SWITCHES_H_
+#ifndef ASH_COMMON_ASH_SWITCHES_H_
+#define ASH_COMMON_ASH_SWITCHES_H_
 
 #include "ash/ash_export.h"
 
 #include "build/build_config.h"
 
 namespace ash {
 namespace switches {
 
 // Note: If you add a switch, consider if it needs to be copied to a subsequent
 // command line if the process executes a new copy of itself.  (For example,
@@ skipping 36 matching lines @@
 #endif
 
 #if defined(OS_CHROMEOS)
 // True if the pointer (cursor) position should be kept inside root windows.
 ASH_EXPORT bool ConstrainPointerToRoot();
 #endif
 
 }  // namespace switches
 }  // namespace ash
 
-#endif  // ASH_ASH_SWITCHES_H_
+#endif  // ASH_COMMON_ASH_SWITCHES_H_