Eliminate ash::internal namespace

ash/wm/screen_dimmer.cc

 // 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.
 
 #include "ash/wm/screen_dimmer.h"
 
 #include "ash/shell.h"
 #include "base/time/time.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace ash {
-namespace internal {
-
 namespace {
 
 // Opacity for |dimming_layer_| when it's dimming the screen.
 const float kDimmingLayerOpacity = 0.4f;
 
 // Duration for dimming animations, in milliseconds.
 const int kDimmingTransitionMs = 200;
 
 }  // namespace
 
@@ skipping 30 matching lines @@
   dimming_layer_->SetOpacity(should_dim ? kDimmingLayerOpacity : 0.0f);
 }
 
 void ScreenDimmer::OnWindowBoundsChanged(aura::Window* root,
                                          const gfx::Rect& old_bounds,
                                          const gfx::Rect& new_bounds) {
   if (dimming_layer_)
     dimming_layer_->SetBounds(gfx::Rect(root->bounds().size()));
 }
 
-}  // namespace internal
 }  // namespace ash