Revert of Gather the ServiceWorker client information in the browser process.

Revert of Gather the ServiceWorker client information in the browser process. (patchset #8 id:140001 of https://codereview.chromium.org/871013003/)

Reason for revert:
This patch is causing http/tests/serviceworker/clients-getall.html to fail on the mac bots:

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=http%2Ftests%2Fserviceworker%2Fclients-getall.html&showLargeExpectations=true

Original issue's description:
> Gather the ServiceWorker client information in the browser process.
>
> This is also adding some logic about empty and invalid
> ServiceWorkerClientInfo.
>
> BUG=450634
>
> Committed: https://crrev.com/5d6924925a291a7cf394a685772251c83a63f99f
> Cr-Commit-Position: refs/heads/master@{#313982}

TBR=jochen@chromium.org,michaeln@chromium.org,tsepez@chromium.org,mlamouri@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=450634
Committed: https://crrev.com/c313f474933df016da94fbeb0892152a0d8e5b0f
Cr-Commit-Position: refs/heads/master@{#314052}

[horo, 2015-01-31 10:02:21]

Created Revert of Gather the ServiceWorker client information in the browser
process.

[commit-bot: I haz the power, 2015-01-31 10:03:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/893783002/1

[commit-bot: I haz the power, 2015-01-31 10:05:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-31 10:06:43]

Patchset 1 (id:??) landed as
https://crrev.com/c313f474933df016da94fbeb0892152a0d8e5b0f
Cr-Commit-Position: refs/heads/master@{#314052}