Use a direct include of strings headers in chromeos/.

chromeos/dbus/update_engine_client.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 "chromeos/dbus/update_engine_client.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "dbus/bus.h"
 #include "dbus/message.h"
 #include "dbus/object_path.h"
 #include "dbus/object_proxy.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
 namespace {
 
 // Returns UPDATE_STATUS_ERROR on error.
@@ skipping 316 matching lines @@
 UpdateEngineClient* UpdateEngineClient::Create(
     DBusClientImplementationType type,
     dbus::Bus* bus) {
   if (type == REAL_DBUS_CLIENT_IMPLEMENTATION)
     return new UpdateEngineClientImpl(bus);
   DCHECK_EQ(STUB_DBUS_CLIENT_IMPLEMENTATION, type);
   return new UpdateEngineClientStubImpl();
 }
 
 }  // namespace chromeos