Use a direct include of strings headers in chrome/installer/, part 2.

chrome/installer/util/google_update_experiment_util.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 "chrome/installer/util/google_update_experiment_util.h"
 
 #include <vector>
 
 #include "base/logging.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time.h"
 
 namespace installer {
 
 namespace {
 
 const char* const kDays[] =
     { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
 
@@ skipping 24 matching lines @@
                                         then.day_of_month,
                                         kMonths[then.month - 1],
                                         then.year,
                                         then.hour,
                                         then.minute,
                                         then.second));
 }
 
 }  // namespace installer