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I am moving all widget styles into button.css. I will later rename it widget.css. This way, the rules that are common can be shared.

The next step will be to update/merge checkbox.css into button.css.

BUG=103688,115404
TEST=visual


Review URL: http://codereview.chromium.org/9579001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124845 0039d316-1c4b-4281-b951-d872f2087c98