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This CL converts TestServicePtr and TestServiceRequest
to new Mojo types.

It uses Remote, PendingReceiver and Receiver instead of
QueryableDataStorePtr, QueryableDataStoreRequest and Binding.

Bug: 955171
Change-Id: I61f3d6b66ac6f5faffe533800bbe482a2db772ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803948
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697068}