Revert "Metal rendering should account for cropping."

This reverts commit fc4a9c933326cac2eb048eb507e63021c75e705e.

Reason for revert: Remote video is not showing in a video call.

Original change's description:
> Metal rendering should account for cropping.
> 
> Also:
> - added a rotation override to allow ignoring frame rotation
> - fixed a couple of minor issues
> - made it possible to run the MTKView without the DisplayLink
> 
> Bug: webrtc:9301
> Change-Id: Ia83c152d9b6d45d56ceb80d287b5d3eacfaebddd
> Reviewed-on: https://webrtc-review.googlesource.com/78282
> Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
> Reviewed-by: Anders Carlsson <andersc@webrtc.org>
> Commit-Queue: Peter Hanspers <peterhanspers@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#23452}

TBR=andersc@webrtc.org,kthelgason@webrtc.org,peterhanspers@webrtc.org

Change-Id: Iddf7793368531d2d7268c1ec138bb3a9874a4ab7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9301
Reviewed-on: https://webrtc-review.googlesource.com/80020
Reviewed-by: JT Teh <jtteh@webrtc.org>
Commit-Queue: JT Teh <jtteh@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23455}

sdk/objc/Framework/Headers/WebRTC/RTCMTLVideoView.h

@@ -10,7 +10,6 @@
 
 #import <Foundation/Foundation.h>
 
-#import "WebRTC/RTCVideoFrame.h"
 #import "WebRTC/RTCVideoRenderer.h"
 
 // Check if metal is supported in WebRTC.
@@ -36,21 +35,7 @@ RTC_EXPORT
 
 @property(nonatomic, weak) id<RTCVideoViewDelegate> delegate;
 
-@property(nonatomic) UIViewContentMode videoContentMode;
-
-/** @abstract Enables/disables rendering.
- */
-@property(nonatomic, getter=isEnabled) BOOL enabled;
-
-/** @abstract   If YES, the backing MTKView will use a display link to issue
-   draw calls.
-    @discussion Default is YES.
- */
-@property(nonatomic) BOOL useDisplayLink;
-
-/** @abstract Wrapped RTCVideoRotation, or nil.
- */
-@property(nullable) NSValue* rotationOverride;
+- (void)setVideoContentMode:(UIViewContentMode)mode;
 
 @end