Eliminate ash::internal namespace

ash/wm/app_list_controller.h

Index: ash/wm/app_list_controller.h
diff --git a/ash/wm/app_list_controller.h b/ash/wm/app_list_controller.h
index 2e4175839ed18c7b14f1ff993532383b992d17f5..c2eb0ad3589168891b6d802fae394af6eea0bfa3 100644
--- a/ash/wm/app_list_controller.h
+++ b/ash/wm/app_list_controller.h
@@ -33,8 +33,6 @@ namespace test {
 class AppListControllerTestApi;
 }
 
-namespace internal {
-
 // AppListController is a controller that manages app list UI for shell.
 // It creates AppListView and schedules showing/hiding animation.
 // While the UI is visible, it monitors things such as app list widget's
@@ -139,7 +137,6 @@ class AppListController : public ui::EventHandler,
   DISALLOW_COPY_AND_ASSIGN(AppListController);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_APP_LIST_CONTROLLER_H_