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New class wraps network logic and allows sending GET and POST requests,
indicating that both request and response content types should be
serialized protobufs.

Bug: 1113598
Change-Id: Iccb65cd734025bde6df7bf927698d90d19b5b0a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404796Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#815158}