Remove flaky expectation for fast/events/touch/send-oncancel-event.html

It consistently passed for a while now

BUG=261278

Review URL: https://chromiumcodereview.appspot.com/19698003

git-svn-id: svn://svn.chromium.org/blink/trunk@154666 bbb929c8-8fbe-4397-9dbb-9b2b20218538