Fixed regression in about:policy from revision 235005.

Fixed regression in about:policy from revision 235005.

The Profile's PolicyService does not include the DeviceCloudPolicyManager since
https://codereview.chromium.org/60823003, but about:policy reads policy data
from that service.

This change adds the DeviceCloudPolicyManager to the Profile's PolicyService
too, but unlike the platform provide it is not wrapped by a
ForwardingPolicyProvider, since it's not currently used as a source of
policy for components for the profile.

BUG=321281
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=237083

[Joao da Silva, 2013-11-22 17:27:35]

Thanks for spotting this! PTAL

[Mattias Nissler (ping if slow), 2013-11-22 18:05:17]

This looks good, but here's one thing I don't understand. The original CL also
dropped the testing provider from being included if I'm not mistaken, shouldn't
that have broken all the tests that inject a global testing provider?

[Joao da Silva, 2013-11-25 09:01:20]

The testing provider overrides the platform provider, which is still injected.

[Mattias Nissler (ping if slow), 2013-11-25 09:28:12]

On 2013/11/25 09:01:20, Joao da Silva wrote:
> The testing provider overrides the platform provider, which is still injected.

Ah, I had missed that change. FWIW, I found the old way where BPC created the
providers clearer, but this fix LGTM.

[commit-bot: I haz the power, 2013-11-25 09:31:38]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/joaodasilva@chromium.org/83413003/1

[commit-bot: I haz the power, 2013-11-25 10:05:37]

Retried try job too often on mac_rel for step(s) telemetry_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-11-25 10:12:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/joaodasilva@chromium.org/83413003/1

[commit-bot: I haz the power, 2013-11-25 16:22:55]

Change committed as 237083