[Extensions] Remove BaseFeatureProvider

chrome/common/extensions/api/_manifest_features.json

 // 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.
 
 // This features file defines manifest keys implemented under src/chrome.
 // See chrome/common/extensions/api/_features.md to understand this file, as
-// well as feature.h, simple_feature.h, and base_feature_provider.h.
+// well as feature.h, simple_feature.h, and feature_provider.h.
 
 {
   "about_page": {
     "channel": "stable",
     "extension_types": ["shared_module"]
   },
   "app.icon_color": {
     "channel": "stable",
     "extension_types": ["hosted_app"]
   },
@@ skipping 237 matching lines @@
   },
   "update_url": {
     "channel": "stable",
     "extension_types": "all"
   },
   "url_handlers": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   }
 }