GTK Themes: Fix painting issues where GTK theme engine was painting over buttons.
GTK Themes: Fix painting issues where GTK theme engine was painting over buttons.

So it looks like some themeing engines in distros more recent than Hardy paint
random boxes of the default background if you don't pass an explicit clip area
to gtk_paint_shadow().

http://crbug.com/18129

Review URL: http://codereview.chromium.org/159754

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@22242 0039d316-1c4b-4281-b951-d872f2087c98

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