[Refactor] to rename and re-layer the file_util stack layers.

webkit/fileapi/quota_file_util.h

 // 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.
 
 #ifndef WEBKIT_FILEAPI_QUOTA_FILE_UTIL_H_
 #define WEBKIT_FILEAPI_QUOTA_FILE_UTIL_H_
 
 #include "base/memory/scoped_ptr.h"
-#include "webkit/fileapi/file_system_file_util.h"
 #include "webkit/fileapi/file_system_operation_context.h"
+#include "webkit/fileapi/fileapi_file_util.h"
+#include "webkit/fileapi/overlay_file_util.h"
 #pragma once
 
 namespace fileapi {
 
-class QuotaFileUtil : public FileSystemFileUtil {
+class QuotaFileUtil : public OverlayFileUtil {
  public:
   static const int64 kNoLimit;
 
   // |underlying_file_util| is owned by the instance.  It will be deleted by
   // the owner instance.  For example, it can be instanciated as follows:
-  // FileSystemFileUtil* file_util = new QuotaFileUtil(new SomeFileUtil());
+  // FileUtil* file_util = new QuotaFileUtil(new SomeFileUtil());
   //
-  // To instanciate an object whose underlying file_util is FileSystemFileUtil,
+  // To instanciate an object whose underlying file_util is FileUtil,
   // QuotaFileUtil::CreateDefault() can be used.
-  explicit QuotaFileUtil(FileSystemFileUtil* underlying_file_util);
+  explicit QuotaFileUtil(FileUtil* underlying_file_util);
   virtual ~QuotaFileUtil();
 
-  // Creates a QuotaFileUtil instance with an underlying FileSystemFileUtil
-  // instance.
+  // Creates a QuotaFileUtil instance with an underlying FileUtil instance.
   static QuotaFileUtil* CreateDefault();
 
   // TODO(dmikurube): Make this function variable by the constructor.
   int64 ComputeFilePathCost(const FilePath& file_path) const;
 
   virtual base::PlatformFileError CreateOrOpen(
       FileSystemOperationContext* fs_context,
       const FilePath& file_path, int file_flags,
       PlatformFile* file_handle, bool* created) OVERRIDE;
 
@@ skipping 21 matching lines @@
   virtual base::PlatformFileError DeleteSingleDirectory(
       FileSystemOperationContext* fs_context,
       const FilePath& file_path) OVERRIDE;
 
   virtual base::PlatformFileError Truncate(
       FileSystemOperationContext* fs_context,
       const FilePath& path,
       int64 length) OVERRIDE;
 
  private:
-  scoped_ptr<FileSystemFileUtil> underlying_file_util_;
-
   // TODO(dmikurube): Make these constants variable by the constructor.
   //
   // These values are based on Obfuscation DB.  See crbug.com/86114 for the
   // source of these numbers.  These should be revisited if
   // * the underlying tables change,
   // * indexes in levelDB change, or
   // * another path name indexer is provided in addition to levelDB.
   //
   // When these values are changed, the usage cache should be bumped up.
   static const int64 kFilePathCostPerChar;
   static const int64 kFilePathCostPerFile;
 
   bool CanCopyFile(
       FileSystemOperationContext* fs_context,
       const FilePath& src_file_path,
       const FilePath& dest_file_path,
       int64 allowed_bytes_growth,
       int64* growth) const;
 
   DISALLOW_COPY_AND_ASSIGN(QuotaFileUtil);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_QUOTA_FILE_UTIL_H_