Cleanup usage of scoped_ptr<> in remoting for C++11

remoting/protocol/ssl_hmac_channel_authenticator.cc

Index: remoting/protocol/ssl_hmac_channel_authenticator.cc
diff --git a/remoting/protocol/ssl_hmac_channel_authenticator.cc b/remoting/protocol/ssl_hmac_channel_authenticator.cc
index f4bedeadf93039d696fe769d943683f9d12270df..575f21584020989a69c5057dfab9493abd3f9343 100644
--- a/remoting/protocol/ssl_hmac_channel_authenticator.cc
+++ b/remoting/protocol/ssl_hmac_channel_authenticator.cc
@@ -280,12 +280,12 @@ void SslHmacChannelAuthenticator::CheckDone(bool* callback_called) {
     if (callback_called)
       *callback_called = true;
 
-    CallDoneCallback(net::OK, socket_.PassAs<net::StreamSocket>());
+    CallDoneCallback(net::OK, socket_.Pass());
   }
 }
 
 void SslHmacChannelAuthenticator::NotifyError(int error) {
-  CallDoneCallback(error, scoped_ptr<net::StreamSocket>());
+  CallDoneCallback(error, nullptr);
 }
 
 void SslHmacChannelAuthenticator::CallDoneCallback(