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It's now possible to mock out the network service and run the
authenticator code against the desktop code in a test environment.

BUG=1002262

Change-Id: Ie2bf611d529baddfb1d04be1b0c60d6c4026d419
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419337
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#810740}