Repair ChangeLog after push-to-trunk.

BUG=
TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/201693002

git-svn-id: https://v8.googlecode.com/svn/trunk@19968 ce2b1a6d-e550-0410-aec6-3dcde31c8c00