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Pushing to internal repo does not require a netrc any more (uses a
more fancy auth with role accounts and ACLs). Hence removing the
support code for it.

A downstream test instantiates the OrderfileUpdater. Make the
constructor argument optional to avoid changing downstream code
simultaneously.

Bug: 1021528
Change-Id: Ie902bdd1d7272f7d884f6ce2e99e9983a1aa5166
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934330Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718654}