Final minor fix in WebRtcAudioManager

TBR=perkj
BUG=NONE

Review URL: https://webrtc-codereview.appspot.com/45879004

Cr-Commit-Position: refs/heads/master@{#8878}
diff --git a/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java
index 3012708..4472a61 100644
--- a/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java
+++ b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java
@@ -93,7 +93,6 @@
     // Restore previously stored audio states.
     setSpeakerphoneOn(savedIsSpeakerPhoneOn);
     audioManager.setMode(savedAudioMode);
-    audioManager.abandonAudioFocus(null);
   }
 
   private void storeAudioParameters() {