Remove bitratePriority from the Obj-C RTCRtpEncodingParameters wrapper.

This was added in CL 135122, but the bitratePriority parameter is not
standard and not implemented in a way users would expect. So it should
actually not be exposed in the Obj-C SDK.

Bug: webrtc:10438
Change-Id: I801ce940a32701d2703e951ef2b601c606aa2111
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135287
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27861}

sdk/objc/api/peerconnection/RTCRtpEncodingParameters.h

@@ -51,9 +51,6 @@ RTC_OBJC_EXPORT
 /** The SSRC being used by this encoding. */
 @property(nonatomic, readonly, nullable) NSNumber *ssrc;
 
-/** The relative bitrate priority. */
-@property(nonatomic, assign) double bitratePriority;
-
 /** The relative DiffServ Code Point priority. */
 @property(nonatomic, assign) double networkPriority;
 

sdk/objc/api/peerconnection/RTCRtpEncodingParameters.mm

@@ -22,7 +22,6 @@
 @synthesize numTemporalLayers = _numTemporalLayers;
 @synthesize scaleResolutionDownBy = _scaleResolutionDownBy;
 @synthesize ssrc = _ssrc;
-@synthesize bitratePriority = _bitratePriority;
 @synthesize networkPriority = _networkPriority;
 
 - (instancetype)init {
@@ -57,7 +56,6 @@
     if (nativeParameters.ssrc) {
       _ssrc = [NSNumber numberWithUnsignedLong:*nativeParameters.ssrc];
     }
-    _bitratePriority = nativeParameters.bitrate_priority;
     _networkPriority = nativeParameters.network_priority;
   }
   return self;
@@ -88,7 +86,6 @@
   if (_ssrc != nil) {
     parameters.ssrc = absl::optional<uint32_t>(_ssrc.unsignedLongValue);
   }
-  parameters.bitrate_priority = _bitratePriority;
   parameters.network_priority = _networkPriority;
   return parameters;
 }