[html-tests] Make some writable cssom-view attributes that we only allow setting from chrome act the way readonly replaceables would when called from content. (#1746)

Upstreamed from https://bugzilla.mozilla.org/show_bug.cgi?id=1151940

View on GitHub: https://github.com/w3c/web-platform-tests/pull/1746

Received on Thursday, 9 April 2015 17:28:00 UTC