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NPAPI plugin support has been removed from chrome and the "plugins" extension
manifest key is effectively deprecated. This CL removes PluginInfo from the
public header and removes all its external usages. This should ensure that we
don't somehow use the plugins specified as part of the manifest.

This CL also changes sync_helper::IsSyncable to not consider the "plugins"
manifest key/permission while deciding whether an extension is syncable.

BUG=732590

Change-Id: Ib7b97304655e17720eaee6e225ac1a82becfe8f7
Reviewed-on: https://chromium-review.googlesource.com/784282Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518752}