[NetworkChangeNotifier] Return more specific network connection types (ethernet/wifi) on OSX

net/base/network_config_watcher_mac.cc

 // Copyright (c) 2012 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 "net/base/network_config_watcher_mac.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 49 matching lines @@
 
 NetworkConfigWatcherMacThread::~NetworkConfigWatcherMacThread() {
   // Allow IO because Stop() calls PlatformThread::Join(), which is a blocking
   // operation. This is expected during shutdown.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
 
   Stop();
 }
 
 void NetworkConfigWatcherMacThread::Init() {
-  // Disallow IO to make sure NetworkConfigWatcherMacThread's helper thread does
-  // not perform blocking operations.
-  base::ThreadRestrictions::SetIOAllowed(false);
-
+  base::ThreadRestrictions::SetIOAllowed(true);
   delegate_->Init();
 
   // TODO(willchan): Look to see if there's a better signal for when it's ok to
   // initialize this, rather than just delaying it by a fixed time.
   const base::TimeDelta kInitializationDelay = base::TimeDelta::FromSeconds(1);
   task_runner()->PostDelayedTask(
       FROM_HERE, base::Bind(&NetworkConfigWatcherMacThread::InitNotifications,
                             weak_factory_.GetWeakPtr()),
       kInitializationDelay);
 }
@@ skipping 40 matching lines @@
   // We create this notifier thread because the notification implementation
   // needs a thread with a CFRunLoop, and there's no guarantee that
   // MessageLoop::current() meets that criterion.
   base::Thread::Options thread_options(base::MessageLoop::TYPE_UI, 0);
   notifier_thread_->StartWithOptions(thread_options);
 }
 
 NetworkConfigWatcherMac::~NetworkConfigWatcherMac() {}
 
 }  // namespace net