Revert "Fix rendering on an iPhone X's tall screen."

This reverts commit 4feb2044db4b3563323c24e2372885cbf7708c73.

Reason for revert: Landscape video was not showing as aspect fit as before. .

Original change's description:
> Fix rendering on an iPhone X's tall screen.
>
> Bug: webrtc:8884
> Change-Id: I850e4ea1919837e15a78c90968a4879a1ccbd22c
> Reviewed-on: https://webrtc-review.googlesource.com/52761
> Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
> Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#22011}

TBR=magjed@webrtc.org,kthelgason@webrtc.org,jtteh@webrtc.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: webrtc:8884
Change-Id: I17bcdaf945d74540538162934cd3265240cc9302
Reviewed-on: https://webrtc-review.googlesource.com/68841
Commit-Queue: JT Teh <jtteh@webrtc.org>
Reviewed-by: JT Teh <jtteh@webrtc.org>
Reviewed-by: Zeke Chin <tkchin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22828}
diff --git a/sdk/objc/Framework/Classes/Metal/RTCMTLVideoView.m b/sdk/objc/Framework/Classes/Metal/RTCMTLVideoView.m
index 5334edb..0fd8a1a 100644
--- a/sdk/objc/Framework/Classes/Metal/RTCMTLVideoView.m
+++ b/sdk/objc/Framework/Classes/Metal/RTCMTLVideoView.m
@@ -90,7 +90,7 @@
   if (_metalView) {
     _metalView.delegate = self;
     [self addSubview:_metalView];
-    _metalView.contentMode = UIViewContentModeScaleAspectFill;
+    _metalView.contentMode = UIViewContentModeScaleAspectFit;
   }
 }