Revert of Clear GCM data when the user clears cookies and other site data

Revert of Clear GCM data when the user clears cookies and other site data (patchset #6 id:100001 of https://codereview.chromium.org/562423002/)

Reason for revert:
We're not longer doing this.

Original issue's description:
> Clear GCM data when the user clears cookies and other site data
>
> This is needed for the work to drop GCM sign-in enforcement. Since
> we no longer wipe out the GCM data when the user signs out, we need
> to give user a chance to clear the data if he or she wants.
>
> BUG=384041
> TEST=Manual test by selecting "Cookies and other site and plugin data"
>
> Committed: https://crrev.com/6967652cefa1e306d21e70d4a12dcc0ac572c28b
> Cr-Commit-Position: refs/heads/master@{#294754}

TBR=bauerb@chromium.org,fgorski@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=384041
Committed: https://crrev.com/11ba40b0dc3dd641702e8c50229c4facb5096107
Cr-Commit-Position: refs/heads/master@{#296989}

[jianli, 2014-09-26 18:37:12]

Created Revert of Clear GCM data when the user clears cookies and other site
data

[commit-bot: I haz the power, 2014-09-26 18:37:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/608813003/1

[commit-bot: I haz the power, 2014-09-26 18:38:58]

Committed patchset #1 (id:1) as 825b51425c6e6c5d9033ec5043a496a3e1defbe7

[commit-bot: I haz the power, 2014-09-26 18:39:42]

Patchset 1 (id:??) landed as
https://crrev.com/11ba40b0dc3dd641702e8c50229c4facb5096107
Cr-Commit-Position: refs/heads/master@{#296989}