Font Settings API: Use Chrome settings CSS in sample extension.

As suggested by UI leads, to polish the sample extension's UI.

BUG=114805
TBR=mpcomplete

Review URL: https://chromiumcodereview.appspot.com/10907052

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@154729 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed