Disable another composited query assertion.

Hopefully this is the last of them...

TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/176633003

git-svn-id: svn://svn.chromium.org/blink/trunk@167648 bbb929c8-8fbe-4397-9dbb-9b2b20218538