bug 1171957 - Remove redundant feature tests
bug 1171957 - Remove redundant feature tests

jwhitlock/web-platform-compat,renoirb/browsercompat,mdn/browsercompat,jwhitlock/web-platform-compat,renoirb/browsercompat,mdn/browsercompat,jwhitlock/web-platform-compat,renoirb/browsercompat,mdn/browsercompat