chromeos: Move files in //ash/common to //ash, part 2

ash/wm/screen_dimmer.h

Index: ash/wm/screen_dimmer.h
diff --git a/ash/common/wm/screen_dimmer.h b/ash/wm/screen_dimmer.h
similarity index 94%
rename from ash/common/wm/screen_dimmer.h
rename to ash/wm/screen_dimmer.h
index 1667b057553fe948bea4712cb21d519e7f52ed6b..90064bfe4dcc03ff9fc36be12e9964d28a3b0b82 100644
--- a/ash/common/wm/screen_dimmer.h
+++ b/ash/wm/screen_dimmer.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_COMMON_WM_SCREEN_DIMMER_H_
-#define ASH_COMMON_WM_SCREEN_DIMMER_H_
+#ifndef ASH_WM_SCREEN_DIMMER_H_
+#define ASH_WM_SCREEN_DIMMER_H_
 
 #include <memory>
 #include <vector>
@@ -77,4 +77,4 @@ class ASH_EXPORT ScreenDimmer : public ShellObserver {
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_WM_SCREEN_DIMMER_H_
+#endif  // ASH_WM_SCREEN_DIMMER_H_