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This CL moves MediaStreamAudioRenderer, MediaStreamVideoRenderer
and MediaStreamRendererFactory from content/public/renderer
to blink/public/platform/modules/mediastream

All three interfaces get a Web prefix since they are intended to
remain in public/platform, as they come form content/public/renderer.

This is a straightforward move and rename and all changes outside
third_party/blink are mechanical (#include, namespace and type name
updates).

Bug: 921006
Change-Id: I1568e58ccaf8d4581ce8bc4ebdae199c3e67366d
TBR: haraken@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1450128
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633759}