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InternalAppContextMenu was added to support a custom context menu for
Plugin VM but no longer appears to be used.

Change-Id: Ide138a0a22eeb1356ad723e533bbfd9f20e1aeec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2164136Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762705}