iwyu: Include stringprintf.h where appropriate, part 2.

chrome/browser/importer/firefox_importer_utils.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 "chrome/browser/importer/firefox_importer_utils.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
+#include "base/stringprintf.h"
+#include "base/string_number_conversions.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
-#include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_model.h"
 #include "chrome/browser/search_engines/template_url_parser.h"
 #include "chrome/browser/search_engines/template_url_prepopulate_data.h"
 #include "googleurl/src/gurl.h"
 
 namespace {
 
@@ skipping 429 matching lines @@
   }
 
   // String values have double quotes we don't need to return to the caller.
   if (content[start] == '\"' && content[stop - 1] == '\"') {
     ++start;
     --stop;
   }
 
   return content.substr(start, stop - start);
 }