Remove last dependencies on ui/base from ui/gfx

BUG=103304
R=sky@chromium.org

Review URL: https://codereview.chromium.org/23498059

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225722 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225722