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A GinPort's onDisconnect may invalidate the context
(e.g. MessagingApiTest.MessagingBackgroundOnly). Attempting to
invalidate the events throws an exception which interferes with the
extensions JS testing framework.

Now the framework can call more of the safe builtins without triggering
the exception, so we do so here.

Bug: 803668
Change-Id: I07aa962ba689174a4f35885c72a9c3318256ff50
Reviewed-on: https://chromium-review.googlesource.com/c/1342068Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609821}