The following tests should be using dumpAsMarkup editing/execCommand/hilitecolor.html editing/style/remove-underline-from-stylesheet.html editing/undo/redo-style.html
Turned out that editing/undo/redo-style.html doesn't need to be converted since it's already a dumpAsText test and the output doesn't rely on the DOM or a subtree.
Created attachment 62489 [details] converts the tests.
Landed as http://trac.webkit.org/changeset/64013. Thank you for the responsive review, Darin.