Eliminate ash::internal namespace

ash/shelf/shelf_window_watcher_item_delegate.h

Index: ash/shelf/shelf_window_watcher_item_delegate.h
diff --git a/ash/shelf/shelf_window_watcher_item_delegate.h b/ash/shelf/shelf_window_watcher_item_delegate.h
index 7a40f638c5b63db9e4e733ea5dcc33bd06031353..9de8f6fbf0bb26b1db65287c051edf606e0b4127 100644
--- a/ash/shelf/shelf_window_watcher_item_delegate.h
+++ b/ash/shelf/shelf_window_watcher_item_delegate.h
@@ -14,11 +14,8 @@ class Window;
 }
 
 namespace ash {
-
 class ShelfModel;
 
-namespace internal {
-
 // ShelfItemDelegate for the items created by ShelfWindowWatcher.
 class ShelfWindowWatcherItemDelegate : public ShelfItemDelegate {
  public:
@@ -45,7 +42,6 @@ class ShelfWindowWatcherItemDelegate : public ShelfItemDelegate {
   DISALLOW_COPY_AND_ASSIGN(ShelfWindowWatcherItemDelegate);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WINDOW_WATCHER_ITEM_DELEGATE_H_