iwyu: Include stringprintf.h where appropriate, part 3.

chrome/common/extensions/extension_unittest.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/common/extensions/extension.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
 #include "base/format_macros.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/i18n/rtl.h"
 #include "base/path_service.h"
+#include "base/stringprintf.h"
 #include "base/string_number_conversions.h"
-#include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension_action.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_error_utils.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/url_constants.h"
 #include "content/common/json_value_serializer.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/mime_sniffer.h"
@@ skipping 1529 matching lines @@
   EXPECT_TRUE(Extension::GenerateId("test", &result));
   EXPECT_EQ(result, "jpignaibiiemhngfjkcpokkamffknabf");
 
   EXPECT_TRUE(Extension::GenerateId("_", &result));
   EXPECT_EQ(result, "ncocknphbhhlhkikpnnlmbcnbgdempcd");
 
   EXPECT_TRUE(Extension::GenerateId(
       "this_string_is_longer_than_a_single_sha256_hash_digest", &result));
   EXPECT_EQ(result, "jimneklojkjdibfkgiiophfhjhbdgcfi");
 }