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

chrome/installer/util/master_preferences_unittest.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.
 //
 // Unit tests for master preferences related methods.
 
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/installer/util/master_preferences.h"
 #include "chrome/installer/util/master_preferences_constants.h"
 #include "chrome/installer/util/util_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 class MasterPreferencesTest : public testing::Test {
  protected:
@@ skipping 405 matching lines @@
     prefs.GetBool(
         installer::master_preferences::kDoNotCreateQuickLaunchShortcut,
         &do_not_create_quick_launch_shortcut);
     prefs.GetBool(
         installer::master_preferences::kDoNotCreateTaskbarShortcut,
         &do_not_create_taskbar_shortcut);
     EXPECT_FALSE(do_not_create_desktop_shortcut);
     EXPECT_FALSE(do_not_create_quick_launch_shortcut);
     EXPECT_FALSE(do_not_create_taskbar_shortcut);
 }