Revert of [ServivceWorker] Treat rejecting respondWith as a Network Error

Revert of [ServivceWorker] Treat rejecting respondWith as a Network Error (patchset #4 id:60001 of https://codereview.chromium.org/571843003/)

Reason for revert:
WebServiceWorkerResponse's status is not initialised.
This may cause problems.

I will re-land this patch after https://codereview.chromium.org/575153002/ is submitted.

Original issue's description:
> [ServivceWorker] Treat rejecting respondWith as a Network Error
> 
> Chromium side change is this: https://codereview.chromium.org/574643003/
> 
> 
> BUG=411173
> TEST=layouttest http/tests/serviceworker/
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182147

TBR=yhirano@chromium.org,mkwst@chromium.org,tkent@chromium.org,nhiroki@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=411173
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182204

[horo, 2014-09-18 00:01:40]

Created Revert of [ServivceWorker] Treat rejecting respondWith as a Network
Error

[commit-bot: I haz the power, 2014-09-18 00:02:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/580993002/1

[commit-bot: I haz the power, 2014-09-18 00:03:23]

Committed patchset #1 (id:1) as 182204

[tkent, 2014-09-18 01:04:56]

lgtm

[horo, 2014-09-19 01:22:47]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/585733002/ by horo@chromium.org.

The reason for reverting is: Landed the patch to initialize
WebServiceWorkerResponse's status.

https://codereview.chromium.org/575153002/.