Fix Array.prototype.push and Array.prototype.unshift for read-only length.

BUG=
R=mstarzinger@chromium.org, mvstanton@chromium.org

Review URL: https://codereview.chromium.org/279773002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21423 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove usage of Locker/Unlocker where possible.

This is possible because we removed DebuggerAgent.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/286903004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21424 ce2b1a6d-e550-0410-aec6-3dcde31c8c00