The expected behaviour of the web setting is that explicitly set sizes actually work.
Created attachment 130178 [details] Patch
Comment on attachment 130178 [details] Patch Looks good
Comment on attachment 130178 [details] Patch Clearing flags on attachment: 130178 Committed r109814: <http://trac.webkit.org/changeset/109814>
All reviewed patches have been landed. Closing bug.