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The ComponentCloudPolicyService is used to fetch policy for Chrome components
such as extensions. This change makes it follow the sign-in state by observing
the cloud policy store and a cloud policy core, which determine that state
from the cloud policy system perspective.

The component policy cache will be cleared on signout.

The ComponentCloudPolicyService now tracks a CloudPolicyCore to determine
whether a CloudPolicyClient is available or not; it is possible to signin
and signout multiple times.

BUG=108992

Review URL: https://codereview.chromium.org/72793003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235747 0039d316-1c4b-4281-b951-d872f2087c98