Oilpan: fix build after r191721 (b3a40c954).

Source/modules/permissions/PermissionController.h

Index: Source/modules/permissions/PermissionController.h
diff --git a/Source/modules/permissions/PermissionController.h b/Source/modules/permissions/PermissionController.h
index 5e7797a61f9c0493fa22bec37efffb1767b25271..7152c4432f0e797b9401d4ca9cce734a12347287 100644
--- a/Source/modules/permissions/PermissionController.h
+++ b/Source/modules/permissions/PermissionController.h
@@ -13,9 +13,11 @@ namespace blink {
 class WebPermissionClient;
 
 class PermissionController final
-    : public WillBeHeapSupplement<LocalFrame>
+    : public NoBaseWillBeGarbageCollectedFinalized<PermissionController>
+    , public WillBeHeapSupplement<LocalFrame>
     , public FrameDestructionObserver {
     WTF_MAKE_NONCOPYABLE(PermissionController);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PermissionController);
 public:
     virtual ~PermissionController();