Update ServiceWorkerVersionBrowserTest.FetchEvent_respondWithRejection

Update ServiceWorkerVersionBrowserTest.FetchEvent_respondWithRejection

https://codereview.chromium.org/1228233007/ adds another message.
So this CL updates the expectation of the test.

1/3 chromium: https://codereview.chromium.org/1254523002/
2/3 blink: https://codereview.chromium.org/1228233007/
3/3 chromium: this cl.

BUG=505784
Committed: https://crrev.com/e9ca9a85160ecd3c9e3ddbe74fe70e9babb9efae
Cr-Commit-Position: refs/heads/master@{#340425}

[horo, 2015-07-23 02:30:50]

horo@chromium.org changed reviewers:
+ falken@chromium.org

[horo, 2015-07-23 02:30:51]

falken@
Could you please review this?

[falken, 2015-07-23 07:36:00]

lgtm

[horo, 2015-07-27 02:15:14]

The CQ bit was checked by horo@chromium.org

[commit-bot: I haz the power, 2015-07-27 02:15:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1252503006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1252503006/1

[commit-bot: I haz the power, 2015-07-27 07:03:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-27 07:04:25]

Patchset 1 (id:??) landed as
https://crrev.com/e9ca9a85160ecd3c9e3ddbe74fe70e9babb9efae
Cr-Commit-Position: refs/heads/master@{#340425}