Update text expectations for failing http/tests/security/contentSecurityPolicy/1.1/plugintypes-invalid.html

BUG=278497
TBR=jianli@chromium.org

Review URL: https://codereview.chromium.org/23104007

git-svn-id: svn://svn.chromium.org/blink/trunk@156652 bbb929c8-8fbe-4397-9dbb-9b2b20218538