Apply missing kParentDirectory check

BUG=161564

Review URL: https://chromiumcodereview.appspot.com/11414046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168692 0039d316-1c4b-4281-b951-d872f2087c98
void ChildProcessSecurityPolicyImpl::RegisterDisabledSchemes(
    const std::set<std::string>& schemes) {
  base::AutoLock lock(lock_);
  disabled_schemes_ = schemes;
}

void ChildProcessSecurityPolicyImpl::RegisterDisabledSchemes(
    const std::set<std::string>& schemes) {
  base::AutoLock lock(lock_);
  disabled_schemes_ = schemes;
}
