1 files changed, 7 insertions, 2 deletions
diff --git a/chromium/third_party/WebKit/Source/core/dom/IdTargetObserver.h b/chromium/third_party/WebKit/Source/core/dom/IdTargetObserver.h
index e76b8a5dbf0..71ee604cde4 100644
--- a/chromium/third_party/WebKit/Source/core/dom/IdTargetObserver.h
+++ b/chromium/third_party/WebKit/Source/core/dom/IdTargetObserver.h
@@ -26,22 +26,27 @@
 #ifndef IdTargetObserver_h
 #define IdTargetObserver_h
 
+#include "platform/heap/Handle.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 class IdTargetObserverRegistry;
 
-class IdTargetObserver {
+class IdTargetObserver : public NoBaseWillBeGarbageCollectedFinalized<IdTargetObserver> {
 public:
     virtual ~IdTargetObserver();
+    virtual void trace(Visitor*);
     virtual void idTargetChanged() = 0;
+    virtual void unregister();
 
 protected:
     IdTargetObserver(IdTargetObserverRegistry&, const AtomicString& id);
 
 private:
-    IdTargetObserverRegistry* m_registry;
+    IdTargetObserverRegistry& registry() { return *m_registry; }
+
+    RawPtrWillBeMember<IdTargetObserverRegistry> m_registry;
     AtomicString m_id;
 };