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NPAPI plugin support has been removed from chrome and the plugins specified in
the "plugins" extension manifest key are not used currently. This CL removes the
manifest handler for the "plugins" key, the "plugins" manifest feature and
updates the public documentation. After this CL, loading an extension with the
plugins manifest key specified should cause an install warning.

BUG=732590
TEST=Load an unpacked extension which specifies a plugin as part of the
"plugins" manifest key. Ensure that an install warning is raised saying that the
"plugins" key is unrecognized.

Change-Id: Ic5aa4958af1257cb776508638e3c690fb6a57eb4
Reviewed-on: https://chromium-review.googlesource.com/783517
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521538}