[Chromoting] Audio playback won't work after switching default playback device

We can only capture audio for the default device now. So we need to update audio
components after switching a default playback device in Windows.

BUG=628814

Review-Url: https://codereview.chromium.org/2163473002
Cr-Commit-Position: refs/heads/master@{#407390}
2 files changed