Fix leak on hovering over a scrollbar and re-fix similar leak for text inputs (bug 42895) by adding a "general" method for unrooting anonymous content created through nsIAnonymousContentCreator, plus a hack to deal with the scrollbars on the root element. Some of the other SetDocumentForAnonymousContent methods *may* need to be implemented. Chris Waterson helped significantly with this patch. r=waterson,hyatt b=45676 (nsbeta3+)

layout/forms/nsFileControlFrame.cpp

@@ -155,6 +155,15 @@ nsFileControlFrame::CreateAnonymousContent(nsIPresContext* aPresContext,
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsFileControlFrame::SetDocumentForAnonymousContent(nsIDocument* aDocument,
+                                                   PRBool aDeep,
+                                                   PRBool aCompileEventHandlers)
+{
+  // XXX WRITE ME
+  return NS_OK;
+}
+
 // Frames are not refcounted, no need to AddRef
 NS_IMETHODIMP
 nsFileControlFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)