Oilpan: extend tracing over WebFrame trees.

Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1557 matching lines @@
 }
 
 WebLocalFrameImpl::~WebLocalFrameImpl()
 {
     Platform::current()->decrementStatsCounter(webFrameActiveCount);
     frameCount--;
 
     cancelPendingScopingEffort();
 }
 
+#if ENABLE(OILPAN)
 void WebLocalFrameImpl::trace(Visitor* visitor)
 {
-#if ENABLE(OILPAN)
     visitor->trace(m_frame);
     visitor->trace(m_printContext);
     visitor->trace(m_geolocationClientProxy);
+    visitor->registerWeakMembers<WebLocalFrameImpl, &WebLocalFrameImpl::clearWeakMembers>(this);
+    WebFrame::traceFrames(visitor, this);
+}
 
-    WebFrame::traceChildren(visitor, this);
+void WebLocalFrameImpl::clearWeakMembers(Visitor* visitor)
+{
+    WebFrame::clearWeakFrames(visitor, this);
+}
 #endif
-}
 
 void WebLocalFrameImpl::setCoreFrame(PassRefPtrWillBeRawPtr<LocalFrame> frame)
 {
     m_frame = frame;
 
     // FIXME: we shouldn't add overhead to every frame by registering these objects when they're not used.
     if (m_frame) {
         OwnPtr<NotificationPresenterImpl> notificationPresenter = adoptPtr(new NotificationPresenterImpl());
         if (m_client)
             notificationPresenter->initialize(m_client->notificationPresenter());
@@ skipping 315 matching lines @@
 
 void WebLocalFrameImpl::invalidateAll() const
 {
     ASSERT(frame() && frame()->view());
     FrameView* view = frame()->view();
     view->invalidateRect(view->frameRect());
     invalidateScrollbar();
 }
 
 } // namespace blink