Simplify Supplementables post Oilpan.

third_party/WebKit/Source/core/dom/Document.h

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 3eddb35e7a63135855251d32fd526c0084a275c5..0c6bf6f14dfba21d1fa828382d8140c5b5e1ff60 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -212,8 +212,7 @@ enum DocumentClass {
 
 using DocumentClassFlags = unsigned char;
 
-class CORE_EXPORT Document : public ContainerNode, public TreeScope, public SecurityContext, public ExecutionContext
-    , public HeapSupplementable<Document>, public DocumentLifecycleNotifier {
+class CORE_EXPORT Document : public ContainerNode, public TreeScope, public SecurityContext, public ExecutionContext, public Supplementable<Document>, public DocumentLifecycleNotifier {
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(Document);
 public:
@@ -1405,7 +1404,7 @@ private:
     int m_nodeCount;
 };
 
-extern template class CORE_EXTERN_TEMPLATE_EXPORT HeapSupplement<Document>;
+extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Document>;
 
 inline bool Document::shouldOverrideLegacyDescription(ViewportDescription::Type origin)
 {