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Revert of Delete the class WebRtcVideoCapturerAdapter::MediaVideoFrameFactory (patchset #5 id:80001 of https://codereview.chromium.org/2244213002/ )

Reason for revert:
Somehow breaks timestamping. Reverting for investigation. To reproduce, run

./browser_tests --gtest_filter='WebRtcVideoQualityBrowserTests/WebRtcVideoQualityBrowserTest*' --run-manual --ui-test-action-max-timeout=200000

This produces lots of warnings like

[1:14:0822/153830:WARNING:video_capture_input.cc(79)] Same/old NTP timestamp (3680861906110 <= 3680861906110) for incoming frame. Dropping.
[1:14:0822/153830:WARNING:video_capture_input.cc(79)] Same/old NTP timestamp (3680861906042 <= 3680861906042) for incoming frame. Dropping.

Original issue's description:
> Delete the class WebRtcVideoCapturerAdapter::MediaVideoFrameFactory
>
> Instead, use the AdaptFrame and OnFrame methods of the VideoCapturer
> base class.
>
> This cl also applies the new timestamp aligner logic, to translate
> Chrome's camera timestamps into the timescale of rtc::TimeMicros(). No
> other change in behavior is intended.
>
> BUG=webrtc:5682, webrtc:5740, 516700
>
> Committed: https://crrev.com/5b9a4b339447b033ca52244a02c0bef17067385f
> Cr-Commit-Position: refs/heads/master@{#413093}

TBR=perkj@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5682, webrtc:5740, 516700

Review-Url: https://codereview.chromium.org/2263183002
Cr-Commit-Position: refs/heads/master@{#413444}