Don't call unconfigureWebRTCSession if setConfiguration fails. webrtc:7471

webrtc/modules/audio_device/ios/objc/RTCAudioSession.mm

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 670 matching lines @@
   RTCLog(@"Configuring audio session for WebRTC.");
 
   // Configure the AVAudioSession and activate it.
   // Provide an error even if there isn't one so we can log it.
   NSError *error = nil;
   RTCAudioSessionConfiguration *webRTCConfig =
       [RTCAudioSessionConfiguration webRTCConfiguration];
   if (![self setConfiguration:webRTCConfig active:YES error:&error]) {
     RTCLogError(@"Failed to set WebRTC audio configuration: %@",
                 error.localizedDescription);
-    [self unconfigureWebRTCSession:nil];
+    // Do not call setActive:NO if setActive:YES failed.
     if (outError) {
       *outError = error;
     }
     return NO;
   }
 
   // Ensure that the device currently supports audio input.
   // TODO(tkchin): Figure out if this is really necessary.
   if (!self.inputAvailable) {
     RTCLogError(@"No audio input path is available!");
@@ skipping 172 matching lines @@
 - (void)notifyDidStopPlayOrRecord {
   for (auto delegate : self.delegates) {
     SEL sel = @selector(audioSessionDidStopPlayOrRecord:);
     if ([delegate respondsToSelector:sel]) {
       [delegate audioSessionDidStopPlayOrRecord:self];
     }
   }
 }
 
 @end