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Add tests for remotely hosted code in isolated worlds for Mv2 and Mv3
extensions. This tests that operations in an isolated world which
execute remotely hosted code are prohibited using a strict CSP.

BUG=896041

Change-Id: Iec0433d023445adf27d463b5f259d6a2b63196e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451501
Auto-Submit: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816378}