Change {Obfuscated|Local}FileSystemFileUtil non-Singleton to take an underlying *FileUtil.

webkit/fileapi/sandbox_mount_point_provider.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_SANDBOX_MOUNT_POINT_PROVIDER_H_
 #define WEBKIT_FILEAPI_SANDBOX_MOUNT_POINT_PROVIDER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 97 matching lines @@
   // specified by |origin_url| and |type|.
   // (The path is similar to the origin's root path but doesn't contain
   // the 'unique' part.)
   // Returns an empty path if the given type is invalid.
   // This method can only be called on the file thread.
   FilePath GetBaseDirectoryForOriginAndType(
       const GURL& origin_url,
       FileSystemType type,
       bool create) const;
 
-  FileSystemFileUtil* GetFileSystemFileUtil();
+  virtual FileSystemFileUtil* GetFileSystemFileUtil();
 
   // Deletes the data on the origin and reports the amount of deleted data
   // to the quota manager via |proxy|.
   bool DeleteOriginDataOnFileThread(
       quota::QuotaManagerProxy* proxy,
       const GURL& origin_url,
       FileSystemType type);
 
   // Quota util methods.
   virtual void GetOriginsForTypeOnFileThread(
@@ skipping 51 matching lines @@
 
   // Acccessed only on the file thread.
   std::set<GURL> visited_origins_;
 
   DISALLOW_COPY_AND_ASSIGN(SandboxMountPointProvider);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_SANDBOX_MOUNT_POINT_PROVIDER_H_