Fix ambiguity in API if no matching system language is found

R=reed@google.com, wangxianzhu@chromium.org

Author: djsollen@google.com

Review URL: https://codereview.chromium.org/26325003

git-svn-id: http://skia.googlecode.com/svn/trunk/src@11641 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed