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

chrome/chrome_tests.gypi

 # Copyright (c) 2012 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1218 matching lines @@
         'browser/extensions/settings/settings_sync_unittest.cc',
         'browser/extensions/settings/settings_test_util.cc',
         'browser/extensions/settings/settings_test_util.h',
         'browser/extensions/settings/testing_settings_storage_unittest.cc',
         'browser/extensions/updater/extension_updater_unittest.cc',
         'browser/extensions/user_script_listener_unittest.cc',
         'browser/extensions/user_script_master_unittest.cc',
         'browser/extensions/webstore_inline_installer_unittest.cc',
         'browser/external_protocol/external_protocol_handler_unittest.cc',
         'browser/favicon/favicon_handler_unittest.cc',
+        'browser/file_select_helper_unittest.cc',
         'browser/first_run/first_run_unittest.cc',
         'browser/geolocation/chrome_geolocation_permission_context_unittest.cc',
         'browser/geolocation/geolocation_settings_state_unittest.cc',
         'browser/geolocation/wifi_data_provider_unittest_chromeos.cc',
         'browser/global_keyboard_shortcuts_mac_unittest.mm',
         'browser/google/google_search_counter_unittest.cc',
         'browser/google/google_update_settings_unittest.cc',
         'browser/google/google_url_tracker_unittest.cc',
         'browser/google/google_util_unittest.cc',
         'browser/gpu_blacklist_unittest.cc',
@@ skipping 3376 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }