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With this CL, device policy invalidation keeps track of the highest
invalidation version that has been handled (= policy has been reloaded
for this version already) when one invalidation is destroyed and another
created.

BUG=358699
TEST=WIP

Review URL: https://codereview.chromium.org/460573005

Cr-Commit-Position: refs/heads/master@{#289411}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289411 0039d316-1c4b-4281-b951-d872f2087c98