Eliminate ash::internal namespace

ash/display/display_change_observer_chromeos.cc

 // 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.
 
 #include "ash/display/display_change_observer_chromeos.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_layout_store.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/display/chromeos/display_mode.h"
 #include "ui/display/chromeos/display_snapshot.h"
 #include "ui/gfx/display.h"
 
 namespace ash {
-namespace internal {
 
 using ui::OutputConfigurator;
 
 namespace {
 
 // The DPI threshold to detect high density screen.
 // Higher DPI than this will use device_scale_factor=2.
 const unsigned int kHighDensityDPIThreshold = 170;
 
 // 1 inch in mm.
@@ skipping 137 matching lines @@
 }
 
 void DisplayChangeObserver::OnAppTerminating() {
 #if defined(USE_ASH)
   // Stop handling display configuration events once the shutdown
   // process starts. crbug.com/177014.
   Shell::GetInstance()->output_configurator()->PrepareForExit();
 #endif
 }
 
-}  // namespace internal
 }  // namespace ash