[cros] Bubble font family fix.
[cros] Bubble font family fix.

BUG=chromium-os:113315
TEST=Manual: see bug description.

Review URL: https://chromiumcodereview.appspot.com/9375008

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@121223 0039d316-1c4b-4281-b951-d872f2087c98

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