Use OnceCallback on Mojo interfaces in //chrome/common/media_router
This CL flips `use_once_calback` flag on the Mojo code generator, and
fixes all compile errors after it. After this CL, Mojo interfaces in
//chrome/common/media_router starts using base::OnceCallback instead
of base::Callback on its return value handling.
The migration recipe was:
- Convert pass-by-ref callback objects to pass-by-value.
- Use std::move() to forward it to other consumer, or to invoke it
with Callback::Run().
- Handle wherever copies are required manually.
- Check if the conversion doesn't change the semantics. As the transfer
and invocation clobber the callback object, care about use-after-move.
It's considered safe to consume almost scoped-out callback.
BUG=714018
Review-Url: https://codereview.chromium.org/2867713002
Cr-Commit-Position: refs/heads/master@{#475449}
9 files changed
