DOMUI: Cleanup options_page.css a bit. * Move the 'display: block' property of labels into the checkbox and radio   classes. * Remove now-superfluous properties. * Use input[type=checkbox] instead of the checkbox class where possible.
DOMUI: Cleanup options_page.css a bit.
* Move the 'display: block' property of labels into the checkbox and radio
  classes.
* Remove now-superfluous properties.
* Use input[type=checkbox] instead of the checkbox class where possible.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6046001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@69612 0039d316-1c4b-4281-b951-d872f2087c98

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