Fix warnings

R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/71373003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17688 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Prepare push to trunk.  Now working on version 3.23.4.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/71443002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17689 ce2b1a6d-e550-0410-aec6-3dcde31c8c00