Remove stl_util's deletion function use from content/.

content/renderer/media/rtc_peer_connection_handler.h

Index: content/renderer/media/rtc_peer_connection_handler.h
diff --git a/content/renderer/media/rtc_peer_connection_handler.h b/content/renderer/media/rtc_peer_connection_handler.h
index ea9703b2fcd3976f75fc707a442f7b13903a857e..276e4a41f6b8443f22a862142c0e0aa2f851243a 100644
--- a/content/renderer/media/rtc_peer_connection_handler.h
+++ b/content/renderer/media/rtc_peer_connection_handler.h
@@ -278,9 +278,9 @@ class CONTENT_EXPORT RTCPeerConnectionHandler
   std::unique_ptr<FirstSessionDescription> first_local_description_;
   std::unique_ptr<FirstSessionDescription> first_remote_description_;
 
-  typedef std::map<webrtc::MediaStreamInterface*,
-      content::RemoteMediaStreamImpl*> RemoteStreamMap;
-  RemoteStreamMap remote_streams_;
+  std::map<webrtc::MediaStreamInterface*,
+           std::unique_ptr<content::RemoteMediaStreamImpl>>
+      remote_streams_;
   scoped_refptr<webrtc::UMAObserver> uma_observer_;
   base::TimeTicks ice_connection_checking_start_;