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This CL prepares the move of [1] to Blink, which itself blocks the move of
[2]. [2] holds the move of various headers out of the the Blink exposed
API.

[1] //content/renderer/media/webrtc/mock_peer_connection_impl.h
[2] //content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc

BUG=78725
R=guidou@chromium.org, haraken@chromium.org

Change-Id: I576c86f2a9a5c3efbdd45a1b85ab205f6fa858bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816782
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704673}