Merged r20233 into trunk branch.

Revert "Ship promises and weak collections"

R=rossberg@chromium.org
TBR=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/210993002

git-svn-id: https://v8.googlecode.com/svn/trunk@20235 ce2b1a6d-e550-0410-aec6-3dcde31c8c00