Eliminate ash::internal namespace

ash/wm/boot_splash_screen_chromeos.cc

Index: ash/wm/boot_splash_screen_chromeos.cc
diff --git a/ash/wm/boot_splash_screen_chromeos.cc b/ash/wm/boot_splash_screen_chromeos.cc
index df5765499ef9910f53638d6486d35c6c6275767e..c9516d7605ffe5933f13122f613e9251c942a47c 100644
--- a/ash/wm/boot_splash_screen_chromeos.cc
+++ b/ash/wm/boot_splash_screen_chromeos.cc
@@ -14,7 +14,6 @@
 #include "ui/gfx/canvas.h"
 
 namespace ash {
-namespace internal {
 
 // ui::LayerDelegate that copies the aura host window's content to a ui::Layer.
 class BootSplashScreen::CopyHostContentLayerDelegate
@@ -72,5 +71,4 @@ void BootSplashScreen::StartHideAnimation(base::TimeDelta duration) {
   layer_->SetOpacity(0.0f);
 }
 
-}  // namespace internal
 }  // namespace ash