Oilpan: Ensure that classes with virtual trace methods always have vtables for their left-most base…

Source/modules/geolocation/Geolocation.h

Index: Source/modules/geolocation/Geolocation.h
diff --git a/Source/modules/geolocation/Geolocation.h b/Source/modules/geolocation/Geolocation.h
index 1d4c58f5e347f70c7e45289e61b4543eea0940eb..9989daf2d79d8eaca471b8c37402f2adb683bfc3 100644
--- a/Source/modules/geolocation/Geolocation.h
+++ b/Source/modules/geolocation/Geolocation.h
@@ -56,7 +56,7 @@ class Geolocation FINAL
 public:
     static Geolocation* create(ExecutionContext*);
     virtual ~Geolocation();
-    void trace(Visitor*);
+    virtual void trace(Visitor*);
 
     virtual void stop() OVERRIDE;
     Document* document() const;