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

webkit/fileapi/file_system_mount_point_provider.h

Index: webkit/fileapi/file_system_mount_point_provider.h
diff --git a/webkit/fileapi/file_system_mount_point_provider.h b/webkit/fileapi/file_system_mount_point_provider.h
index edf158f2ed69036ad2a17dbf21c120f3fae5c1aa..bb42649d68df7a4618d91f79a6c95bdf6e8a847e 100644
--- a/webkit/fileapi/file_system_mount_point_provider.h
+++ b/webkit/fileapi/file_system_mount_point_provider.h
@@ -51,6 +51,8 @@ class FileSystemMountPointProvider {
   // provider. This list is used to set appropriate child process file access
   // permissions.
   virtual std::vector<FilePath> GetRootDirectories() const = 0;
+
+  virtual FileSystemFileUtil* GetFileSystemFileUtil() = 0;
 };
 
 // An interface to control external file system access permissions.
@@ -80,4 +82,3 @@ class ExternalFileSystemMountPointProvider
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_MOUNT_POINT_PROVIDER_H_
-