Enable NPAPI plugins if any plugin policies are set.

Once NPAPI is pushed behind a flag in M42, enterprise polices that are set need to re-enable NPAPI plugins correctly.

This CL covers all the policy cases and is intended to be a wide net to catch any/all policies.  We don't particularly mind if this has a few false positives, because NPAPI will be totally gone soon.

BUG=295137
TEST=Set e.g. EnabledPlugins policy.  Check that NPAPI plugins are listed in chrome://plugins

Review URL: https://codereview.chromium.org/930243008

Cr-Commit-Position: refs/heads/master@{#317329}
5 files changed