Increase profiling interval in test-cpu-profiler/CollectCpuProfile to 500ms on Windows

BUG=v8:2628

Review URL: https://codereview.chromium.org/14200014

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14266 ce2b1a6d-e550-0410-aec6-3dcde31c8c00