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This CL converts the uses of CameraService interface as below,

  - Convert CameraServicePtr to mojo::Remote
  - Convert CameraServicePtrInfo to mojo::PendingRemote

Bug: 955171
Change-Id: I5200a2773dfa9ef121de645bedb73d5238a823f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2222087
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#773975}