Work around GC bug to fix flaky autoplay tests

With these changes both tests appear to be reliable.

BUG=357080
BUG=400659

Review URL: https://codereview.chromium.org/441253003

git-svn-id: svn://svn.chromium.org/blink/trunk@179647 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed
tree: 7dc95c2cc01f9629373094f121d4228aef70e6a4
  1. third_party/