Convert most callers of setInlineStyleProperty passing strings to enums or doubles instead

This gets rid of most of our internal callers invoking the CSS parser. There's no reason
to do that, we can just pass the CSSValue or the double value directly. The only place
left was one using a transform translate() which is pretty nasty to code out the values by
hand for. We might consider a nicer API for that in the future.

I also cleaned up callers that were passing false for "important" since that's the default
anyway.

R=eseidel@chromium.org,eae@chromium.org,dglazkov@chromium.org

Review URL: https://chromiumcodereview.appspot.com/19926003

git-svn-id: svn://svn.chromium.org/blink/trunk@154695 bbb929c8-8fbe-4397-9dbb-9b2b20218538