Refactor FileSystemMountPointProvider::CreateFileStream{Reader,Writer}

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 066c2ab3ef216b5e62530d66bb0496dceb09fe2f..9ca3997f73ed8e6091910a1b13028fd54979d2f4 100644
--- a/webkit/fileapi/file_system_mount_point_provider.h
+++ b/webkit/fileapi/file_system_mount_point_provider.h
@@ -104,10 +104,9 @@ class WEBKIT_STORAGE_EXPORT FileSystemMountPointProvider {
   // file's actual modification time to see if the file has been modified, and
   // if it does any succeeding read operations should fail with
   // ERR_UPLOAD_FILE_CHANGED error.
-  // The returned object must be owned and managed by the caller.
   // This method itself does *not* check if the given path exists and is a
   // regular file.
-  virtual webkit_blob::FileStreamReader* CreateFileStreamReader(
+  virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
     const FileSystemURL& url,
     int64 offset,
     const base::Time& expected_modification_time,
@@ -115,10 +114,9 @@ class WEBKIT_STORAGE_EXPORT FileSystemMountPointProvider {
 
   // Creates a new file stream writer for a given filesystem URL |url| with an
   // offset |offset|.
-  // The returned object must be owned and managed by the caller.
   // This method itself does *not* check if the given path exists and is a
   // regular file.
-  virtual FileStreamWriter* CreateFileStreamWriter(
+  virtual scoped_ptr<FileStreamWriter> CreateFileStreamWriter(
       const FileSystemURL& url,
       int64 offset,
       FileSystemContext* context) const = 0;