Change ordering of Shell event handlers:

ash/test/shell_test_api.h

Index: ash/test/shell_test_api.h
diff --git a/ash/test/shell_test_api.h b/ash/test/shell_test_api.h
index f36716a537780cb94602a7fbf3c0335fcf1884e2..926d1dd2c1b02bf2f096bd332182b0306a65a9e3 100644
--- a/ash/test/shell_test_api.h
+++ b/ash/test/shell_test_api.h
@@ -19,6 +19,7 @@ class Shell;
 class LauncherModel;
 
 namespace internal {
+class DragDropController;
 class RootWindowLayoutManager;
 class ScreenPositionController;
 class SystemGestureEventFilter;
@@ -39,6 +40,7 @@ public:
   internal::ScreenPositionController* screen_position_controller();
   AshNativeCursorManager* ash_native_cursor_manager();
   LauncherModel* launcher_model();
+  internal::DragDropController* drag_drop_controller();
 
   void DisableOutputConfiguratorAnimation();