Update expectations for serviceworker/request.html after V8 roll.

The latest V8 roll https://codereview.chromium.org/595883002 tickles
something in this test on ia32 machines.

In debug mode it hits an assert and in release mode it times out.

Updating the test expectations for now while the issue is investigated.

TBR=horo@chromium.org, jkummerow@chromium.org
BUG=409755
NOTRY=true

Review URL: https://codereview.chromium.org/601683002

git-svn-id: svn://svn.chromium.org/blink/trunk@182560 bbb929c8-8fbe-4397-9dbb-9b2b20218538