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... down to renderer/platform/mediastream.

The .cc and test_.cc respective files also got moved from
renderer/platform/export/mediastream to renderer/platform/mediastrea/.

BUG=704136,919392
R=guidou@chromium.org

Change-Id: Ia981d447b28e2b7ad5bcadba3abb13ebc4111f2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1739388
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#684348}