Revert "Revert "[css3-text]  Implement text-decoration property shorthand""

There was an assertion in StyleResolver caused by the lack of runtime
features check in CSS shorthands style that prevented proper
content_shell usage.

This is now fixed in revision 155866:
https://src.chromium.org/viewvc/blink?revision=155866&view=revision

BUG=165462

Review URL: https://chromiumcodereview.appspot.com/22414006

git-svn-id: svn://svn.chromium.org/blink/trunk@155895 bbb929c8-8fbe-4397-9dbb-9b2b20218538