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This CL converts old Mojo types to new Mojo types
in CdmFoo classes except for CdmService::LoadCdm.

  - Convert FooRequest to mojo::PendingReceiver.
  - Convert FooPtr to mojo::PendingRemote or mojo::Remote.
  - Convert the second parameter to mojo::PendingRemote in
    service_manager::GetInterface

Bug: 955171
Change-Id: I9ff169c17829f5ce69ede8c6b3ab991350491047
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883347
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710241}