Index: Source/core/frame/History.h |
diff --git a/Source/core/frame/History.h b/Source/core/frame/History.h |
index 250676451f7cab5d65d7166a06067ca3706278b4..b781985d78b082a51bc2ad7c75d6fee54d9d3536 100644 |
--- a/Source/core/frame/History.h |
+++ b/Source/core/frame/History.h |
@@ -61,7 +61,7 @@ public: |
void stateObjectAdded(PassRefPtr<SerializedScriptValue>, const String& title, const String& url, FrameLoadType, ExceptionState&); |
- void trace(Visitor*) { } |
+ virtual void trace(Visitor*) { } |
private: |
explicit History(LocalFrame*); |