media: Remove SequencedTaskRunnerHandle::Get() usages in UserMediaClientImpl

This is part of efforts to replace base::ThreadTaskRunnerHandle::Get()
and SequencedTaskRunnerHandle::Get() with other appropriate task runners
in the renderer.

Bug: 827065
Change-Id: I4a062ac1db4631215d1ec58bd5d79cc3acc5ba33
Reviewed-on: https://chromium-review.googlesource.com/987833
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547409}
1 file changed