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

net/ftp/ftp_util.cc

 // Copyright (c) 2011 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/ftp/ftp_util.h"
 
 #include <map>
 #include <vector>
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/char_iterator.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/string_number_conversions.h"
 #include "base/string_piece.h"
-#include "base/string_split.h"
 #include "base/string_util.h"
+#include "base/strings/string_split.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/icu/public/common/unicode/uchar.h"
 #include "third_party/icu/public/i18n/unicode/datefmt.h"
 #include "third_party/icu/public/i18n/unicode/dtfmtsym.h"
 
 using base::StringPiece16;
 
 // For examples of Unix<->VMS path conversions, see the unit test file. On VMS
@@ skipping 318 matching lines @@
     while (!iter.end() && !u_isspace(iter.get()))
       iter.Advance();
   }
 
   string16 result(text.substr(iter.array_pos()));
   TrimWhitespace(result, TRIM_ALL, &result);
   return result;
 }
 
 }  // namespace