Gardening. Rebase several xmlhttprequest/origin-exact-matching on mac.

NOTRY=true
TBR=mkwst@chromium.org

Review URL: https://codereview.chromium.org/168583012

git-svn-id: svn://svn.chromium.org/blink/trunk@167297 bbb929c8-8fbe-4397-9dbb-9b2b20218538