Remove timeout expectation for http/tests/misc/acid3.html

The issue that caused timeout has been fixed in r162179. The test no longer times out.

BUG=320732

Review URL: https://codereview.chromium.org/77733013

git-svn-id: svn://svn.chromium.org/blink/trunk@162449 bbb929c8-8fbe-4397-9dbb-9b2b20218538