Fix deopt fuzzer after test runner changes.

Use the same keyboard interrupt logic as run-tests.
Close the perf database explicitly after one run, as it has two runs on the same architecture. Currently the first run closes on garbage collection, which might corrupt the second run.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/284203002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21330 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Adapt test expectations in webkit.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/288163003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21331 ce2b1a6d-e550-0410-aec6-3dcde31c8c00