src/: Update the remaining include paths of string_split.h to its new location.

net/test/remote_test_server.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 "net/test/remote_test_server.h"
 
 #include <vector>
 
 #include "base/base_paths.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
-#include "base/string_split.h"
+#include "base/strings/string_split.h"
 #include "base/values.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/test/spawner_communicator.h"
 
 namespace net {
 
 namespace {
 
@@ skipping 168 matching lines @@
 
   SetResourcePath(document_root, base::FilePath().AppendASCII("net")
                                            .AppendASCII("data")
                                            .AppendASCII("ssl")
                                            .AppendASCII("certificates"));
   return true;
 }
 
 }  // namespace net