Add a mimeHandler extension API.

chrome/chrome_common.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': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 171 matching lines @@
       'common/extensions/manifest_handlers/app_launch_info.cc',
       'common/extensions/manifest_handlers/app_launch_info.h',
       'common/extensions/manifest_handlers/automation.cc',
       'common/extensions/manifest_handlers/automation.h',
       'common/extensions/manifest_handlers/content_scripts_handler.cc',
       'common/extensions/manifest_handlers/content_scripts_handler.h',
       'common/extensions/manifest_handlers/copresence_manifest.h',
       'common/extensions/manifest_handlers/copresence_manifest.cc',
       'common/extensions/manifest_handlers/extension_action_handler.cc',
       'common/extensions/manifest_handlers/extension_action_handler.h',
-      'common/extensions/manifest_handlers/mime_types_handler.cc',
-      'common/extensions/manifest_handlers/mime_types_handler.h',
       'common/extensions/manifest_handlers/minimum_chrome_version_checker.cc',
       'common/extensions/manifest_handlers/minimum_chrome_version_checker.h',
       'common/extensions/manifest_handlers/settings_overrides_handler.cc',
       'common/extensions/manifest_handlers/settings_overrides_handler.h',
       'common/extensions/manifest_handlers/theme_handler.cc',
       'common/extensions/manifest_handlers/theme_handler.h',
       'common/extensions/manifest_handlers/ui_overrides_handler.cc',
       'common/extensions/manifest_handlers/ui_overrides_handler.h',
       'common/extensions/permissions/chrome_api_permissions.cc',
       'common/extensions/permissions/chrome_api_permissions.h',
@@ skipping 465 matching lines @@
         'common/safe_browsing/csd.proto'
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',
         'proto_out_dir': 'chrome/common/safe_browsing',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }