Always reset the audio session configuration after a call.

After returning from the call the AVAudioSession was configured to
use the receiver instead of the speaker for audio output. The
configuration was only restored if the sound loop was previously
playing, this change makes sure that the configuration is always
reset so the sound can be played audibly after a call has been
finished.

Bug: webrtc:7792
Change-Id: Idabf6fadc8041b18722cb8f5e89e0c8c36b1b74d
Reviewed-on: https://chromium-review.googlesource.com/544819
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18754}

webrtc/examples/BUILD.gn

@@ -271,10 +271,6 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
         ":AppRTCMobile_ios_frameworks",
         ":apprtc_common",
         ":apprtc_signaling",
-
-        # TODO(kthelgason): Remove this dep when audio_device has been
-        # moved to sdk.
-        "//webrtc/modules/audio_device:audio_device",
       ]
     }
 

webrtc/examples/objc/AppRTCMobile/ios/ARDMainViewController.m

@@ -235,9 +235,9 @@ static NSString *const loopbackLaunchProcessArgument = @"loopback";
 }
 
 - (void)restartAudioPlayerIfNeeded {
+  [self configureAudioSession];
   if (_mainView.isAudioLoopPlaying && !self.presentedViewController) {
     RTCLog(@"Starting audio loop due to WebRTC end.");
-    [self configureAudioSession];
     [_audioPlayer play];
   }
 }