Replace deprecated base::NonThreadSafe in chrome/browser/devtools in favor of SequenceChecker.

chrome/browser/devtools/device/port_forwarding_controller.cc

 // Copyright 2014 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 "chrome/browser/devtools/device/port_forwarding_controller.h"
 
 #include <map>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
-#include "base/threading/non_thread_safe.h"
 #include "chrome/browser/devtools/devtools_protocol.h"
 #include "chrome/browser/devtools/devtools_protocol_constants.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/prefs/pref_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/address_list.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
@@ skipping 13 matching lines @@
   kStatusError = -3,
   kStatusDisconnecting = -2,
   kStatusConnecting = -1,
   kStatusOK = 0,
 };
 
 namespace tethering = ::chrome::devtools::Tethering;
 
 static const char kDevToolsRemoteBrowserTarget[] = "/devtools/browser";
 
-class SocketTunnel : public base::NonThreadSafe {
+class SocketTunnel {
  public:
   static void StartTunnel(const std::string& host,
                           int port,
                           int result,
                           std::unique_ptr<net::StreamSocket> socket) {
     if (result == net::OK)
       new SocketTunnel(std::move(socket), host, port);
   }
 
  private:
@@ skipping 428 matching lines @@
   if (!forwarding_map_.empty())
     UpdateConnections();
   else
     CloseAllConnections();
 }
 
 void PortForwardingController::UpdateConnections() {
   for (Registry::iterator it = registry_.begin(); it != registry_.end(); ++it)
     it->second->UpdateForwardingMap(forwarding_map_);
 }