Get rid of the virtual/crash test suite.

Making this virtual without a command-line flag doesn't actually
enforce that these tests will get run in their own process.
Having them in the "crash" directory is enough to make it clear
that these tests are expected to crash.

Review URL: https://codereview.chromium.org/53203002

git-svn-id: svn://svn.chromium.org/blink/trunk@160968 bbb929c8-8fbe-4397-9dbb-9b2b20218538