Modified the pepper file chooser API to support filtering files by extensions.

content/public/common/file_chooser_params.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 CONTENT_PUBLIC_COMMON_FILE_CHOOSER_PARAMS_H_
 #define CONTENT_PUBLIC_COMMON_FILE_CHOOSER_PARAMS_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 25 matching lines @@
 
   Mode mode;
 
   // Title to be used for the dialog. This may be empty for the default title,
   // which will be either "Open" or "Save" depending on the mode.
   string16 title;
 
   // Default file name to select in the dialog.
   FilePath default_file_name;
 
-  // A list of valid lower-cased MIME types specified in an input element. It is
-  // used to restrict selectable files to such types.
+  // A list of valid lower-cased MIME types or file extensions specified in an
+  // input element. It is used to restrict selectable files to such types.
   std::vector<string16> accept_types;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_FILE_CHOOSER_PARAMS_H_