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Following https://phabricator.services.mozilla.com/D54699 we do not need
to supply the handle for the shared memory IPC mechanism to the child
until the IPC server has been initialized.

Bug: 1092010
Change-Id: Id82f88513b77db159adf96dbac577ed80de1d37a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337394
Auto-Submit: Alex Gough <ajgo@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799362}