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There are many uses of mojom::ServiceRequest. This CL migrates
them to PendingReceiver<mojom::Service>.

Besides that, ServiceBinding is renamed to ServiceReceiver and
the variable name is also changed from |binding_| to |receiver_|
or |service_binding_| to |service_receiver_|.

Bug: 955171
Change-Id: I1ae084512b307b76956d10ffd21dcf441e7fed2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274485Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#784627}