message: Changed setActive of RTCAudio Session, and it's working
  Cr-Commit-Position: refs/heads/master@{#33429}
diff: @@ -363,24 +363,27 @@ NSString * const kRTCAudioSessionOutputVolumeSelector = @"outputVolume";
  }
  }
  if (success) {
  + if (active) {
  if (shouldSetActive) {
  self.isActive = active;
  - if (active && self.isInterrupted) {
  + if (self.isInterrupted) {
  self.isInterrupted = NO;
  [self notifyDidEndInterruptionWithShouldResumeSession:YES];
  }
  }
  - if (active) {
  [self incrementActivationCount];
  - }
  [self notifyDidSetActive:active];
  + }
  } else {
  RTCLogError(@"Failed to setActive:%d. Error: %@",
  active, error.localizedDescription);
  [self notifyFailedToSetActive:active error:error];
  }
  - // Decrement activation count on deactivation whether or not it succeeded.
  + // Set isActive and decrement activation count on deactivation
  + // whether or not it succeeded.
  if (!active) {
  + self.isActive = active;
  + [self notifyDidSetActive:active];
  [self decrementActivationCount];
  }
  RTCLog(@"Number of current activations: %d", _activationCount);
  