Eliminate ash::internal namespace

ash/display/display_layout_store.h

 // Copyright 2013 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_DISPLAY_DISPLAY_LAYOUT_STORE_H_
 #define ASH_DISPLAY_DISPLAY_LAYOUT_STORE_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
 #include "ash/display/display_layout.h"
 
 namespace ash {
-namespace internal {
 
 class ASH_EXPORT DisplayLayoutStore {
  public:
   DisplayLayoutStore();
   ~DisplayLayoutStore();
 
   const DisplayLayout& default_display_layout() const {
     return default_display_layout_;
   }
   void SetDefaultDisplayLayout(const DisplayLayout& layout);
@@ skipping 31 matching lines @@
 
   // The default display layout.
   DisplayLayout default_display_layout_;
 
   // Display layout per pair of devices.
   std::map<DisplayIdPair, DisplayLayout> paired_layouts_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayLayoutStore);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_LAYOUT_STORE_H_