Revert "Reland "Use non-proxied source object in VideoTrack.""

This reverts commit 2c47235b0ef1c7bc1aeadc7d0e3aed18e131b3c7.

Reason for revert: Downstream issue still doesn't seem to be resolved.

Original change's description:
> Reland "Use non-proxied source object in VideoTrack."
>
> This is a reland of 3eb29c12358930a60134f185cd849e0d12aa9166
>
> This reland doesn't contain the AudioTrack changes (see original
> description) that got triggered in some cases and needs to be
> addressed separately.
>
> Original change's description:
> > Use non-proxied source object in VideoTrack.
> >
> > Use the internal representation of the video source object from the
> > track. Before there were implicit thread hops due to use of the proxy.
> >
> > Also, override AudioTrack's enabled methods to enforce thread
> > expectations.
> >
> > Bug: webrtc:13540
> > Change-Id: I4bc7aca96d6fc24f31ade45e47f52599f1cc2f97
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/250180
> > Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> > Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
> > Cr-Commit-Position: refs/heads/main@{#35911}
>
> Bug: webrtc:13540
> Change-Id: I59997be174cc9278e3e5910d493efd5352e6de68
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/250940
> Auto-Submit: Tomas Gunnarsson <tommi@webrtc.org>
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Commit-Queue: Harald Alvestrand <hta@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#35924}

TBR=tommi@webrtc.org,hta@webrtc.org,webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: Ib9a76db660c5d18203c13b4feaf5b47f56d7e930
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:13540
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/251082
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35930}

pc/video_rtp_receiver.cc

@@ -41,7 +41,11 @@ VideoRtpReceiver::VideoRtpReceiver(
       track_(VideoTrackProxyWithInternal<VideoTrack>::Create(
           rtc::Thread::Current(),
           worker_thread,
-          VideoTrack::Create(receiver_id, source_, worker_thread))),
+          VideoTrack::Create(receiver_id,
+                             CreateVideoTrackSourceProxy(rtc::Thread::Current(),
+                                                         worker_thread,
+                                                         source_),
+                             worker_thread))),
       attachment_id_(GenerateUniqueId()) {
   RTC_DCHECK(worker_thread_);
   SetStreams(streams);