Eliminate ash::internal namespace

ash/system/chromeos/power/video_activity_notifier.cc

Index: ash/system/chromeos/power/video_activity_notifier.cc
diff --git a/ash/system/chromeos/power/video_activity_notifier.cc b/ash/system/chromeos/power/video_activity_notifier.cc
index 8a82fb3b8dcf20ef83ad14d9b1d883e5627b9ce7..07f8490b01f18f6dab6dab83aeac24a67b341ead 100644
--- a/ash/system/chromeos/power/video_activity_notifier.cc
+++ b/ash/system/chromeos/power/video_activity_notifier.cc
@@ -9,8 +9,6 @@
 #include "chromeos/dbus/power_manager_client.h"
 
 namespace ash {
-namespace internal {
-
 namespace {
 
 // Minimum number of seconds between notifications.
@@ -47,5 +45,4 @@ void VideoActivityNotifier::OnLockStateChanged(bool locked) {
   screen_is_locked_ = locked;
 }
 
-}  // namespace internal
 }  // namespace ash