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As part of the process to Onion soup content/renderer/media/stream,
this CL moves webaudio_media_stream_source.cc|h to blink.

Note that for consistency with the other files whose header is
exposed to Chromium in public/platform/modules/mediastream,
the .cc file was place in renderer/platform/exported/mediastream/.

BUG=704136
R=guidou@chromium.org, haraken@chromium.org

Change-Id: I57fb0e3357b91b584149ad36a5e6abeb74d469cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1647197
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667103}