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This converts the V1 unit test, checking pasteboard access in sandboxed
processes, to the V2 sandbox.

Bug: 902597
Change-Id: Id11e2c597a55f9e66f45d1edf6b7c7bcb8396f57
Reviewed-on: https://chromium-review.googlesource.com/c/1327545
Commit-Queue: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611202}