To avoid reference cycles of RefPtr<Node>s, we want to remove unnecessary RefPtr<Node>s. The rationale is described in bug 94324. HTMLProgressElement::m_value does not need to be a RefPtr<Node>, because it is guaranteed to point to a shadow DOM tree of the HTMLProgressElement node, which is guaranteed to exist in the subtree of the HTMLProgressElement node.
Created attachment 159093 [details] Patch
Comment on attachment 159093 [details] Patch ok
Comment on attachment 159093 [details] Patch Clearing flags on attachment: 159093 Committed r125985: <http://trac.webkit.org/changeset/125985>
All reviewed patches have been landed. Closing bug.