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This CL moves a few webrtc-specific files from content/renderer/media
into content/renderer/media/webrtc, to prevent the former folder from
sprawling massively. Also a few files are moved from .../gpu to the
webrtc folder because they are peerconnection-specific. OWNERS files
updated so there are no changes.

No new code whatsoever -- just moving things around.

Instructions used:

$ git mv *web_rtc* webrtc
$ git mv webrtc*.* webrtc
$ git mv rtc*.* webrtc
$ git mv gpu/rtc_video_* webrtc
$ git mv peer_connection* webrtc
$ git mv mock_data_channel_impl* webrtc
$ git mv mock_peer_connection_impl* webrtc

then from the root checkout:
$ tools/git/mass-rename.py

Bug: 739232
Change-Id: Iaa3d87e2986fb9879dd39483c2afaed64552d9a9
Reviewed-on: https://chromium-review.googlesource.com/909188Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535775}