cmap ParseFormat4() should check the first segment

R=yusukes@chromium.org,agl@chromium.org
BUG=chromium:146254
TEST=ran test/test_{un,}malicious_fonts.sh
Review URL: https://chromiumcodereview.appspot.com/10913058

git-svn-id: http://ots.googlecode.com/svn/trunk@95 a4e77c2c-9104-11de-800e-5b313e0d2bf3
1 file changed