aura: Make Linux UI text rendering match GTK Chrome OS.
aura: Make Linux UI text rendering match GTK Chrome OS.

The non-GTK path was previously just using Cairo's default
settings for antialiasing, subpixel order, and hinting.
This change hardcodes the settings to match those currently
loaded from GtkSettings on non-Aura Chrome OS.

BUG=111395
TEST=manual inspection


Review URL: http://codereview.chromium.org/9296042

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@119961 0039d316-1c4b-4281-b951-d872f2087c98

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