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This CL splits the ServiceRequestSender into interface and
implementation. The immediate use case is to allow integration tests to
create their own java-driven instance.

Bug: b/171776026
Change-Id: I32b914afc2807949354727c5741d0bbc8b184cbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2524529
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Marian Fechete <marianfe@google.com>
Cr-Commit-Position: refs/heads/master@{#826258}