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Switching several error callback implementations to use
base::OnceClosure explicitly. All of these previously used
base::Closure (implicitly repeating), but all of them would
only ever run the error callback the first time an error
orrurred. The affected classes are:

1. DemuxerStreamAdapter
2. StreamProvider
3. MediaStream

Bug: 1007810
Change-Id: I872ea38eb27ec00c99137435c0408a93f292f9f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879949Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#709733}