Revert "Expose v8::Function::GetDisplayName to public API."

This reverts commit 54c7b9af65dd349405944bd9ae2f064202dc6e1d.

The new test fails in debug mode.

BUG=chromium:17356
TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/30443006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17325 ce2b1a6d-e550-0410-aec6-3dcde31c8c00