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OutOfProcessInstance requires PPAPI dependencies. So split it away from
the "internal" target, which is migrating away from PPAPI.

Bug: 1103478
Change-Id: Id17208b497b4f2e45c015fc702b82d1c16282771
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2293326
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789974}