Fix a bug that caused timezone setting looked enabled for non-owner users
Fix a bug that caused timezone setting looked enabled for non-owner users

select:hover and select:active take effects only when the control is enabled.
color of select is graytext when the control is disabled

BUG=chromium-os:11291
TEST=confirmed that the setting looked disabled as intended

Review URL: http://codereview.chromium.org/6814042
Patch from Ryo Hashimoto <hashimoto@chromium.org>.

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@81067 0039d316-1c4b-4281-b951-d872f2087c98

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