Allow the user to "repair" a corrupted extension.

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/diagnostics/diagnostics_api.cc',
       'browser/extensions/api/diagnostics/diagnostics_api.h',
       'browser/extensions/api/diagnostics/diagnostics_api_chromeos.cc',
@@ skipping 798 matching lines @@
       'browser/extensions/webstore_inline_installer.cc',
       'browser/extensions/webstore_inline_installer.h',
       'browser/extensions/webstore_inline_installer_factory.cc',
       'browser/extensions/webstore_inline_installer_factory.h',
       'browser/extensions/webstore_install_helper.cc',
       'browser/extensions/webstore_install_helper.h',
       'browser/extensions/webstore_install_with_prompt.cc',
       'browser/extensions/webstore_install_with_prompt.h',
       'browser/extensions/webstore_installer.cc',
       'browser/extensions/webstore_installer.h',
+      'browser/extensions/webstore_reinstaller.cc',
+      'browser/extensions/webstore_reinstaller.h',
       'browser/extensions/webstore_standalone_installer.cc',
       'browser/extensions/webstore_standalone_installer.h',
       'browser/extensions/webstore_startup_installer.cc',
       'browser/extensions/webstore_startup_installer.h',
       'browser/extensions/window_controller.cc',
       'browser/extensions/window_controller.h',
       'browser/extensions/window_controller_list.cc',
       'browser/extensions/window_controller_list.h',
       'browser/extensions/window_controller_list_observer.h',
       'browser/extensions/zipfile_installer.cc',
@@ skipping 263 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }