Revert r16548 due to cpu profiler test falkiness

The change made cctest/test-cpu-profiler/CollectCpuProfile and cctest/test-cpu-profiler/JsNative1JsNative2JsSample flaky.

BUG=v8:2871
TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/23615011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16553 ce2b1a6d-e550-0410-aec6-3dcde31c8c00