Use base::ResetAndReturn() in remoting.

remoting/protocol/fake_authenticator.cc

Index: remoting/protocol/fake_authenticator.cc
diff --git a/remoting/protocol/fake_authenticator.cc b/remoting/protocol/fake_authenticator.cc
index c816cfa09492dd94ea8955d3d5372e62bcbb69cb..d597568b075773d7f908d32f54350b9c1b2f1433 100644
--- a/remoting/protocol/fake_authenticator.cc
+++ b/remoting/protocol/fake_authenticator.cc
@@ -4,6 +4,7 @@
 
 #include "remoting/protocol/fake_authenticator.h"
 
+#include "base/callback_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "net/base/io_buffer.h"
@@ -82,11 +83,9 @@ void FakeChannelAuthenticator::OnAuthBytesRead(int result) {
 }
 
 void FakeChannelAuthenticator::CallDoneCallback() {
-  DoneCallback callback = done_callback_;
-  done_callback_.Reset();
   if (result_ != net::OK)
     socket_.reset();
-  callback.Run(result_, socket_.Pass());
+  base::ResetAndReturn(&done_callback_).Run(result_, socket_.Pass());
 }
 
 FakeAuthenticator::FakeAuthenticator(