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

printing/backend/cups_helper.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 "printing/backend/cups_helper.h"
 
 #include <cups/ppd.h>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
-#include "base/string_split.h"
 #include "base/string_util.h"
+#include "base/strings/string_split.h"
 #include "base/values.h"
 #include "googleurl/src/gurl.h"
 #include "printing/backend/print_backend.h"
 #include "printing/backend/print_backend_consts.h"
 
 // This section contains helper code for PPD parsing for semantic capabilities.
 namespace {
 
 const char kColorDevice[] = "ColorDevice";
 const char kColorModel[] = "ColorModel";
@@ skipping 363 matching lines @@
   caps.color_default = is_color;
 
   ppdClose(ppd);
   file_util::Delete(ppd_file_path, false);
 
   *printer_info = caps;
   return true;
 }
 
 }  // namespace printing