Add ES6 Map and Set to global constructors listing expectations

They will be enabled by V8 in an upcoming roll.

BUG=400507
TBR=arv@chromium.org

Review URL: https://codereview.chromium.org/447833002

git-svn-id: svn://svn.chromium.org/blink/trunk@179641 bbb929c8-8fbe-4397-9dbb-9b2b20218538