Delete Promises Layout Tests.

Promises are now implemented tested in V8.
I delete Promises tests except for tests testing ScriptPromise or
ScriptPromiseResolver.

BUG=352597

Review URL: https://codereview.chromium.org/209443009

git-svn-id: svn://svn.chromium.org/blink/trunk@169916 bbb929c8-8fbe-4397-9dbb-9b2b20218538