Add better handle tracking, and optimize Connector::Accept.

mojo/public/bindings/lib/message.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/public/bindings/lib/message.h"
 
 #include <stdlib.h>
 
 #include <algorithm>
 
 namespace mojo {
 
 Message::Message()
     : data(NULL) {
 }
 
 Message::~Message() {
   free(data);
-  // TODO(darin): Need to Close any handles so they don't leak.
+  std::for_each(handles.begin(), handles.end(), Close);
 }
 
 void Message::Swap(Message* other) {
   std::swap(data, other->data);
   std::swap(handles, other->handles);
 }
 
 }  // namespace mojo