Removed long-running obselete test case.

The test was the 2nd longest-running test case in debug mode, and the
stuff it tests has already been moved long ago to some other place,
which is in turn heavily tested by far simpler and faster things
(%TruncateString etc.).

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/39233003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17361 ce2b1a6d-e550-0410-aec6-3dcde31c8c00