Make Dispatcher::Type an enum class.

mojo/edk/system/message_in_transit.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/message_in_transit.h"
 
 #include <string.h>
 
 #include <ostream>
 
@@ skipping 187 matching lines @@
 
 void MessageInTransit::UpdateTotalSize() {
   DCHECK_EQ(main_buffer_size_ % kMessageAlignment, 0u);
   header()->total_size = static_cast<uint32_t>(main_buffer_size_);
   if (transport_data_) {
     header()->total_size +=
         static_cast<uint32_t>(transport_data_->buffer_size());
   }
 }
 
-std::ostream& operator<<(std::ostream& out, MessageInTransit::Type type) {
-  return out << static_cast<uint16_t>(type);
-}
-
-std::ostream& operator<<(std::ostream& out, MessageInTransit::Subtype subtype) {
-  return out << static_cast<uint16_t>(subtype);
-}
-
 }  // namespace system
 }  // namespace mojo