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This CL flips `use_once_callback` flag on the Mojo code generator, and
fixes all compile errors after it. After this CL, Mojo interfaces in
//media/capture and //services/video_capture start using base::OnceCallback
instead of base::Callback on its return value handling.

Bug: 714018
Change-Id: I0fcf6bfb2511332f53f1a1b01e269ebce4629a71
Reviewed-on: https://chromium-review.googlesource.com/567842
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487408}