don't look in xul namespace for "src" attribute. Images show up again....

don't look in xul namespace for "src" attribute. Images show up again. permission to checkin to closed tree by sar.

layout/xul/base/src/nsTitledButtonFrame.cpp

@@ -1048,7 +1048,7 @@ nsTitledButtonFrame::ImageMayHaveChanged(nsIPresContext* aPresContext)
 
    // get the new image src
    nsString src = "";
-   mContent->GetAttribute(nsXULAtoms::nameSpaceID, nsHTMLAtoms::src, src);
+   mContent->GetAttribute(kNameSpaceID_None, nsHTMLAtoms::src, src);
 
    // if the new image is empty
    if (src.Equals("")) {