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Previously we were specifying to use Open Sans but the font isn't loaded on Android.
Use the webfont hosted on Google and update CSP to allow it.

Review URL: https://codereview.chromium.org/443343002

Cr-Commit-Position: refs/heads/master@{#288497}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288497 0039d316-1c4b-4281-b951-d872f2087c98