| Index: Source/core/dom/Fullscreen.h | 
| diff --git a/Source/core/dom/Fullscreen.h b/Source/core/dom/Fullscreen.h | 
| index eb2e6550adf3854a9b4f473255dbb2bac7e06e7a..725011a0479493edbd854c0e8887716c7627a121 100644 | 
| --- a/Source/core/dom/Fullscreen.h | 
| +++ b/Source/core/dom/Fullscreen.h | 
| @@ -46,7 +46,7 @@ class ComputedStyle; | 
|  | 
| class CORE_EXPORT Fullscreen final | 
| : public NoBaseWillBeGarbageCollectedFinalized<Fullscreen> | 
| -    , public DocumentSupplement | 
| +    , public WillBeHeapSupplement<Document> | 
| , public DocumentLifecycleObserver { | 
| WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Fullscreen); | 
| public: | 
|  |