Use a direct include of utf_string_conversions.h in android_webview/, apps/, ash/, base/.

ash/system/chromeos/network/network_state_notifier.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 "ash/system/chromeos/network/network_state_notifier.h"
 
 #include "ash/shell.h"
 #include "ash/system/chromeos/network/network_observer.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "base/string16.h"
 #include "base/string_util.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chromeos/network/network_connection_handler.h"
 #include "chromeos/network/network_event_log.h"
 #include "chromeos/network/network_state.h"
 #include "chromeos/network/network_state_handler.h"
 #include "grit/ash_strings.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using chromeos::NetworkConnectionHandler;
 using chromeos::NetworkHandler;
@@ skipping 223 matching lines @@
     VLOG(2) << " Network: " << network->path();
     cached_state_[network->path()] = network->connection_state();
   }
   const NetworkState* default_network =
       NetworkHandler::Get()->network_state_handler()->DefaultNetwork();
   if (default_network && default_network->IsConnectedState())
     last_active_network_ = default_network->path();
 }
 
 }  // namespace ash