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This CL applies mojo::PendingRemote and mojo::Remote
to all uses of PrintSessionInstance interface.

Bug: 955171
Change-Id: I5a31ea941d9d8d8456f1880dcf0b4abc390d0b49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228295Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#774894}