DOMUI Prefs: Improve focus appearance on Mac
DOMUI Prefs: Improve focus appearance on Mac

Partially styling focus rings on the Mac looks weird, and we can't do completely custom styling that looks good until outlines follow border-radius correctly, so use the standard OS look. Also adjust button focus ring location on the Mac to adjust for changes to button elements.

BUG=None
TEST=Focus rings in DOMUI prefs should look have the standard platform look on the Mac.

Review URL: http://codereview.chromium.org/6320015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@72572 0039d316-1c4b-4281-b951-d872f2087c98

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