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Add variable checkout_ios_internal to conditionally fetch ios_internal.
Use pinned revision to ensure build stays hermetic and reproducible.

Bug: 803846
Change-Id: Id8ba650400b283645f8c00629dd269739d813195
Reviewed-on: https://chromium-review.googlesource.com/880903
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532437}