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

chrome/installer/util/set_reg_value_work_item_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.
 
 #include <windows.h>
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/win/registry.h"
 #include "chrome/installer/util/set_reg_value_work_item.h"
 #include "chrome/installer/util/work_item.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::win::RegKey;
 
 namespace {
 
 const wchar_t kTestRoot[] = L"TempTemp";
@@ skipping 237 matching lines @@
   std::wstring data(kDataStr1);
   scoped_ptr<SetRegValueWorkItem> work_item(
       WorkItem::CreateSetRegValueWorkItem(HKEY_CURRENT_USER, parent_key,
                                           name, data, false));
   EXPECT_FALSE(work_item->Do());
 
   work_item.reset(WorkItem::CreateSetRegValueWorkItem(HKEY_CURRENT_USER,
       parent_key, name, dword1, false));
   EXPECT_FALSE(work_item->Do());
 }