Delete more webkit.org tests.

Moved some of the tests over to StaleTestExpectations as they're part
of an imported test suite, so it didn't make sense to delete them.

BUG=308779, 310258

Review URL: https://codereview.chromium.org/35673002

git-svn-id: svn://svn.chromium.org/blink/trunk@160273 bbb929c8-8fbe-4397-9dbb-9b2b20218538