Delete perf tests that are WontFixed.

We skip all the perf tests on debug builds, so these [ Release ]
lines in StaleTestExpectations meant we were skipping these tests
everywhere. No point in keeping them in the tree.

TBR=nbarth@chromium.org
BUG=308779

Review URL: https://codereview.chromium.org/51383002

git-svn-id: svn://svn.chromium.org/blink/trunk@160878 bbb929c8-8fbe-4397-9dbb-9b2b20218538