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With the recent introduction of FakeServerInvalidationSender which
excerises FCM-based invalidation production code, the
FakeServerInvalidationService isn't needed anymore.

Change-Id: I18b8eba337c27d9d3f7a5d12dd101ed5aea0c38f
Bug: 985287
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758242
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689579}