[Extensions] Remove the Infobar API

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/enterprise_platform_keys/enterprise_platform_keys_api.cc',
       'browser/extensions/api/enterprise_platform_keys/enterprise_platform_keys_api.h',
       'browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc',
@@ skipping 559 matching lines @@
       'browser/extensions/extension_garbage_collector.cc',
       'browser/extensions/extension_garbage_collector.h',
       'browser/extensions/extension_garbage_collector_chromeos.cc',
       'browser/extensions/extension_garbage_collector_chromeos.h',
       'browser/extensions/extension_garbage_collector_factory.cc',
       'browser/extensions/extension_garbage_collector_factory.h',
       'browser/extensions/extension_gcm_app_handler.cc',
       'browser/extensions/extension_gcm_app_handler.h',
       'browser/extensions/extension_icon_manager.cc',
       'browser/extensions/extension_icon_manager.h',
-      'browser/extensions/extension_infobar_delegate.cc',
-      'browser/extensions/extension_infobar_delegate.h',
       'browser/extensions/extension_install_checker.cc',
       'browser/extensions/extension_install_checker.h',
       'browser/extensions/extension_install_prompt.cc',
       'browser/extensions/extension_install_prompt.h',
       'browser/extensions/extension_install_prompt_experiment.cc',
       'browser/extensions/extension_install_prompt_experiment.h',
       'browser/extensions/extension_install_prompt_show_params.cc',
       'browser/extensions/extension_install_prompt_show_params.h',
       'browser/extensions/extension_install_ui_util.cc',
       'browser/extensions/extension_install_ui_util.h',
@@ skipping 465 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }