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

chrome/installer/util/move_tree_work_item_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 <windows.h>
 
 #include <fstream>
 
 #include "base/base_paths.h"
 #include "base/file_util.h"
 #include "base/files/memory_mapped_file.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "chrome/installer/util/installer_util_test_common.h"
 #include "chrome/installer/util/move_tree_work_item.h"
 #include "chrome/installer/util/work_item.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 class MoveTreeWorkItemTest : public testing::Test {
  protected:
   virtual void SetUp() {
     ASSERT_TRUE(temp_from_dir_.CreateUniqueTempDir());
@@ skipping 508 matching lines @@
   // the source files.
   EXPECT_TRUE(file_util::PathExists(from_dir1));
   EXPECT_TRUE(file_util::PathExists(to_dir));
   EXPECT_TRUE(file_util::PathExists(orig_to_file));
   EXPECT_EQ(0, ReadTextFile(orig_to_file).compare(kTextContent1));
   EXPECT_EQ(0, ReadTextFile(from_file).compare(kTextContent1));
 
   // Also, after rollback the new "to" file should be gone.
   EXPECT_FALSE(file_util::PathExists(new_to_file2));
 }