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

chrome/installer/util/install_util_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 <string>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/test/test_reg_util_win.h"
 #include "base/win/registry.h"
 #include "chrome/installer/util/google_update_constants.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/product_unittest.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using base::win::RegKey;
 using registry_util::RegistryOverrideManager;
 using ::testing::_;
@@ skipping 413 matching lines @@
                                      WriteInto(&short_expect, MAX_PATH),
                                      MAX_PATH);
   ASSERT_NE(static_cast<DWORD>(0), short_len);
   ASSERT_GT(static_cast<DWORD>(MAX_PATH), short_len);
   short_expect.resize(short_len);
   ASSERT_FALSE(base::FilePath::CompareEqualIgnoreCase(expect.value(),
                                                       short_expect));
   EXPECT_TRUE(InstallUtil::ProgramCompare(expect).Evaluate(
       L"\"" + short_expect + L"\""));
 }