Delete unused test exectation file

We dropped dominators view a while ago and the test was deleted as well.

NOTRY=True
BUG=None

Review URL: https://codereview.chromium.org/651833007

git-svn-id: svn://svn.chromium.org/blink/trunk@184149 bbb929c8-8fbe-4397-9dbb-9b2b20218538