clean up coding style at ash folder.

ash/screen_util.h

 // Copyright 2014 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_SCREEN_UTIL_H_
 #define ASH_SCREEN_UTIL_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 
@@ skipping 38 matching lines @@
                                          const gfx::Rect& rect);
 
   // Returns a gfx::Display object for secondary display. Returns
   // invalid display if there is no secondary display connected.
   static const gfx::Display& GetSecondaryDisplay();
 
   // Returns a gfx::Display object for the specified id.  Returns
   // invalid display if no such display is connected.
   static const gfx::Display& GetDisplayForId(int64 display_id);
 
-private:
+ private:
   ScreenUtil() {}
   ~ScreenUtil() {}
 
   DISALLOW_COPY_AND_ASSIGN(ScreenUtil);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SCREEN_UTIL_H_