base: Move MemoryMappedFile out of file_util.h and into its own header file.

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 "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 {
@@ skipping 384 matching lines @@
   ASSERT_TRUE(file_util::PathExists(from_file));
 
   // // Create a file hierarchy identical to the one in the source directory.
   base::FilePath to_dir(temp_from_dir_.path());
   to_dir = to_dir.AppendASCII("To_Dir");
   ASSERT_TRUE(installer::test::CopyFileHierarchy(from_dir1, to_dir));
 
   // Lock one of the files in the to destination directory to prevent moves.
   base::FilePath orig_to_file(
       to_dir.AppendASCII("From_Dir2").AppendASCII("From_File"));
-  file_util::MemoryMappedFile mapped_file;
+  base::MemoryMappedFile mapped_file;
   EXPECT_TRUE(mapped_file.Initialize(orig_to_file));
 
   // First check that we can't do the regular Move().
   scoped_ptr<MoveTreeWorkItem> work_item(
       WorkItem::CreateMoveTreeWorkItem(from_dir1,
                                        to_dir,
                                        temp_to_dir_.path(),
                                        WorkItem::ALWAYS_MOVE));
   EXPECT_FALSE(work_item->Do());
   work_item->Rollback();
@@ skipping 107 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));
 }