Minor debugger cleanup. Store the running state of the previous debugger response to avoid having to parse the just generated JSON response just to pick out the running state. Also removed an unused function.
Review URL: http://codereview.chromium.org/20039

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1222 ce2b1a6d-e550-0410-aec6-3dcde31c8c00