Address review feedback for r160338

On Windows, use Segoe UI Symbol as emoji font.
On CrOS, use Droid Emoji.
Simplify the defaults, they're overridden anyway.

BUG=62435
TEST=none


Review URL: https://chromiumcodereview.appspot.com/11071011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162045 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed