Style resolver should not add margins to form control elements.

We added some margins to from control elements without width/height
CSS properties. This behavior was not compatible with IE and Firefox, and
was very confusing. We should remove such behavior.

BUG=128306,268692

Review URL: https://codereview.chromium.org/349313007

git-svn-id: svn://svn.chromium.org/blink/trunk@176850 bbb929c8-8fbe-4397-9dbb-9b2b20218538