Move string-typed properties to the new StyleBuilder
https://bugs.webkit.org/show_bug.cgi?id=138295

Reviewed by Antti Koivisto.

Move string-typed properties to the new StyleBuilder:
-webkit-hyphenate-character
-webkit-line-grid
-webkit-flow-into
-webkit-flow-from

No new tests, no behavior change.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175464 268f45cc-cd09-0410-ab3c-d52691b4dbfc