Set infobar text to black (overriding system default color).
Set infobar text to black (overriding system default color).

Since we set the background color, we can't go letting the theme choose the text color unless we want to potentially end up with white on yellow.

Review URL: http://codereview.chromium.org/108034

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@15320 0039d316-1c4b-4281-b951-d872f2087c98

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