Use the appropriate variant of IntToString in //remoting

remoting/protocol/message_decoder_unittest.cc

Index: remoting/protocol/message_decoder_unittest.cc
diff --git a/remoting/protocol/message_decoder_unittest.cc b/remoting/protocol/message_decoder_unittest.cc
index ab36b17c10a0c16585f1baef1f812651669289d0..2c1c56ad4e5a2aed7ff6185d67327b588681b6f7 100644
--- a/remoting/protocol/message_decoder_unittest.cc
+++ b/remoting/protocol/message_decoder_unittest.cc
@@ -91,7 +91,7 @@ void SimulateReadSequence(const int read_sequence[], int sequence_size) {
   for (std::list<EventMessage*>::iterator it =
            message_list.begin();
        it != message_list.end(); ++it) {
-    SCOPED_TRACE("Message " + base::IntToString(index));
+    SCOPED_TRACE("Message " + base::UintToString(index));
 
     EventMessage* message = *it;
     // Partial update stream.