Eliminate ash::internal namespace

ash/wm/workspace_controller_test_helper.h

Index: ash/wm/workspace_controller_test_helper.h
diff --git a/ash/wm/workspace_controller_test_helper.h b/ash/wm/workspace_controller_test_helper.h
index ecdccccca070f0318b6b1153d5661eadb2538f9e..f020c35b4898a0b46dbe3b2a17abf878208a105e 100644
--- a/ash/wm/workspace_controller_test_helper.h
+++ b/ash/wm/workspace_controller_test_helper.h
@@ -8,8 +8,6 @@
 #include "ash/wm/workspace_controller.h"
 
 namespace ash {
-namespace internal {
-
 class MultiWindowResizeController;
 class WorkspaceEventHandler;
 
@@ -27,7 +25,6 @@ class WorkspaceControllerTestHelper {
   DISALLOW_COPY_AND_ASSIGN(WorkspaceControllerTestHelper);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_CONTROLLER_TEST_HELPER_H_