Fixes build issue based on usage of Android O specific API

webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCAudioManager.java

 /*
  *  Copyright 2014 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 433 matching lines @@
     } else {
       final AudioDeviceInfo[] devices = audioManager.getDevices(AudioManager.GET_DEVICES_ALL);
       for (AudioDeviceInfo device : devices) {
         final int type = device.getType();
         if (type == AudioDeviceInfo.TYPE_WIRED_HEADSET) {
           Log.d(TAG, "hasWiredHeadset: found wired headset");
           return true;
         } else if (type == AudioDeviceInfo.TYPE_USB_DEVICE) {
           Log.d(TAG, "hasWiredHeadset: found USB audio device");
           return true;
-        } else if (type == AudioDeviceInfo.TYPE_USB_HEADSET) {
-          Log.d(TAG, "hasWiredHeadset: found USB headset");
-          return true;
         }
       }
       return false;
     }
   }
 
   /**
    * Updates list of possible audio devices and make new device selection.
    * TODO(henrika): add unit test to verify all state transitions.
    */
@@ skipping 122 matching lines @@
               + "available=" + audioDevices + ", "
               + "selected=" + newAudioDevice);
       if (audioManagerEvents != null) {
         // Notify a listening client that audio device has been changed.
         audioManagerEvents.onAudioDeviceChanged(selectedAudioDevice, audioDevices);
       }
     }
     Log.d(TAG, "--- updateAudioDeviceState done");
   }
 }