Fixed crash when PCF is destroyed before RTCRtpTranceiver in ObjC

Bug: webrtc:9231
Change-Id: Icecc319eaf6edd2c4b7b05fda984660412cb0d40
Reviewed-on: https://webrtc-review.googlesource.com/87439
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23884}
diff --git a/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm b/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
index b5c8cba..f6b2343 100644
--- a/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
+++ b/sdk/objc/Framework/Classes/PeerConnection/RTCPeerConnection.mm
@@ -151,9 +151,10 @@
 
 void PeerConnectionDelegateAdapter::OnTrack(
     rtc::scoped_refptr<RtpTransceiverInterface> nativeTransceiver) {
-  RTCRtpTransceiver *transceiver =
-      [[RTCRtpTransceiver alloc] initWithNativeRtpTransceiver:nativeTransceiver];
   RTCPeerConnection *peer_connection = peer_connection_;
+  RTCRtpTransceiver *transceiver =
+      [[RTCRtpTransceiver alloc] initWithFactory:peer_connection.factory
+                            nativeRtpTransceiver:nativeTransceiver];
   if ([peer_connection.delegate
           respondsToSelector:@selector(peerConnection:didStartReceivingOnTransceiver:)]) {
     [peer_connection.delegate peerConnection:peer_connection
@@ -409,8 +410,8 @@
         @"Failed to add transceiver %@: %s", track, nativeTransceiverOrError.error().message());
     return nil;
   }
-  return
-      [[RTCRtpTransceiver alloc] initWithNativeRtpTransceiver:nativeTransceiverOrError.MoveValue()];
+  return [[RTCRtpTransceiver alloc] initWithFactory:self.factory
+                               nativeRtpTransceiver:nativeTransceiverOrError.MoveValue()];
 }
 
 - (RTCRtpTransceiver *)addTransceiverOfType:(RTCRtpMediaType)mediaType {
@@ -428,8 +429,8 @@
                 nativeTransceiverOrError.error().message());
     return nil;
   }
-  return
-      [[RTCRtpTransceiver alloc] initWithNativeRtpTransceiver:nativeTransceiverOrError.MoveValue()];
+  return [[RTCRtpTransceiver alloc] initWithFactory:self.factory
+                               nativeRtpTransceiver:nativeTransceiverOrError.MoveValue()];
 }
 
 - (void)offerForConstraints:(RTCMediaConstraints *)constraints
@@ -554,8 +555,8 @@
       _peerConnection->GetTransceivers());
   NSMutableArray *transceivers = [[NSMutableArray alloc] init];
   for (auto nativeTransceiver : nativeTransceivers) {
-    RTCRtpTransceiver *transceiver =
-        [[RTCRtpTransceiver alloc] initWithNativeRtpTransceiver:nativeTransceiver];
+    RTCRtpTransceiver *transceiver = [[RTCRtpTransceiver alloc] initWithFactory:self.factory
+                                                           nativeRtpTransceiver:nativeTransceiver];
     [transceivers addObject:transceiver];
   }
   return transceivers;