Remove explicit termination of the worker used to test transferring arrays.

This is causing the tab to completely freeze with the newly released Chrome 34.

We don't really need to terminate the worker explicitly.  It gets GCed anyway.
Merge pull request #1604 from AnalyticalGraphicsInc/fixChrome34Worker

Remove explicit termination of the worker used to test transferring arrays
Merge branch 'master' into issue1487