Initialize default audio device ID with explicit device ID.

content/browser/renderer_host/media/media_stream_manager.h

Index: content/browser/renderer_host/media/media_stream_manager.h
diff --git a/content/browser/renderer_host/media/media_stream_manager.h b/content/browser/renderer_host/media/media_stream_manager.h
index b3a5cecf8d2fd01c9103f59cf24732e0535165b1..1b6c79f0d09460e9b80749845c56b9726048187c 100644
--- a/content/browser/renderer_host/media/media_stream_manager.h
+++ b/content/browser/renderer_host/media/media_stream_manager.h
@@ -367,7 +367,8 @@ class CONTENT_EXPORT MediaStreamManager
   // valid alternate device ID.
   // Returns false if the required device ID is present and invalid.
   // Otherwise, if no valid device is found, device_id is unchanged.
-  bool PickDeviceId(const std::string& salt,
+  bool PickDeviceId(MediaStreamType type,
+                    const std::string& salt,
                     const url::Origin& security_origin,
                     const TrackControls& controls,
                     const MediaDeviceInfoArray& devices,