[Service Workers] Follow-up CL for DCHECK from WebServiceWorkerResponse.

[Service Workers] Follow-up CL for DCHECK from WebServiceWorkerResponse.

This patch is a follow-up CL:
  https://codereview.chromium.org/1372423002/#msg15

BUG=537127
Committed: https://crrev.com/7748cc8e1ec3d781acd46c978a2a453cc199402d
Cr-Commit-Position: refs/heads/master@{#354459}

[Pritam Nikam, 2015-10-13 08:11:39]

pritam.nikam@samsung.com changed reviewers:
+ tyoshino@chromium.org

[Pritam Nikam, 2015-10-15 05:44:18]

pritam.nikam@samsung.com changed reviewers:
+ falken@chromium.org, horo@chromium.org

[Pritam Nikam, 2015-10-15 05:45:59]

Hi all,

This patch is a follow-up CL:
  https://codereview.chromium.org/1372423002/#msg15

PTAL, Thanks!

[horo, 2015-10-16 02:15:32]

lgtm

[Pritam Nikam, 2015-10-16 05:06:04]

On 2015/10/16 02:15:32, horo wrote:
> lgtm

Thanks horo :)
I'll go ahead with commit bit.

[Pritam Nikam, 2015-10-16 05:06:07]

The CQ bit was checked by pritam.nikam@samsung.com

[commit-bot: I haz the power, 2015-10-16 05:06:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1403773004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1403773004/1

[tyoshino (SeeGerritForStatus), 2015-10-16 06:16:54]

lgtm

[commit-bot: I haz the power, 2015-10-16 06:30:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-16 06:31:17]

Patchset 1 (id:??) landed as
https://crrev.com/7748cc8e1ec3d781acd46c978a2a453cc199402d
Cr-Commit-Position: refs/heads/master@{#354459}