Drop deprecated memory related notification API

Embedders should use the non-static methods on Isolate with the same
name.

BUG=397026
R=hpayer@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/429593003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22703 ce2b1a6d-e550-0410-aec6-3dcde31c8c00