[Extensions] Remove the Infobar API

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 1284 matching lines @@
       'browser/guest_view/extension_view/chrome_extension_view_guest_delegate.cc',
       'browser/guest_view/extension_view/chrome_extension_view_guest_delegate.h',
       'browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc',
       'browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.h',
       'browser/guest_view/web_view/chrome_web_view_guest_delegate.cc',
       'browser/guest_view/web_view/chrome_web_view_guest_delegate.h',
       'browser/guest_view/web_view/chrome_web_view_permission_helper_delegate.cc',
       'browser/guest_view/web_view/chrome_web_view_permission_helper_delegate.h',
       'browser/guest_view/web_view/context_menu_content_type_web_view.cc',
       'browser/guest_view/web_view/context_menu_content_type_web_view.h',
-      'browser/infobars/infobar_extension_api.cc',
-      'browser/infobars/infobar_extension_api.h',
       'browser/media/cast_transport_host_filter.cc',
       'browser/media/cast_transport_host_filter.h',
       'browser/metrics/extensions_metrics_provider.cc',
       'browser/metrics/extensions_metrics_provider.h',
       'browser/renderer_context_menu/context_menu_content_type_app_mode.cc',
       'browser/renderer_context_menu/context_menu_content_type_app_mode.h',
       'browser/renderer_context_menu/context_menu_content_type_extension_popup.cc',
       'browser/renderer_context_menu/context_menu_content_type_extension_popup.h',
       'browser/renderer_context_menu/context_menu_content_type_platform_app.cc',
       'browser/renderer_context_menu/context_menu_content_type_platform_app.h',
@@ skipping 2393 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }