[Extensions] Remove BaseFeatureProvider

extensions/common/api/_behavior_features.json

 // Copyright 2014 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 switches used to control Extension behaviour,
 // typically whitelist configuration.
 // 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.
 
 {
   "whitelisted_for_incognito": {
     "channel": "stable",
     "extension_types": "all",
     // This is "external_component" for legacy reasons; it should be
     // unnecessary given there's a whitelist.
     "location": "external_component",
     "whitelist": [
       "D5736E4B5CF695CB93A2FB57E4FDC6E5AFAB6FE2",  // http://crbug.com/312900
@@ skipping 65 matching lines @@
       "2F47B526FA71F44816618C41EC55E5EE9543FDCC",  // Braille Keyboard
       "86672C8D7A04E24EFB244BF96FE518C4C4809F73",  // Speech synthesis
       "1CF709D51B2B96CF79D00447300BD3BFBE401D21",  // Mobile activation
       "D519188F86D9ACCEE0412007B227D9936EB9676B",  // Gaia auth extension
       "40FF1103292F40C34066E023B8BE8CAE18306EAE",  // Chromeos help
       "3C654B3B6682CA194E75AD044CEDE927675DDEE8",  // Easy unlock
       "2FCBCE08B34CCA1728A85F1EFBD9A34DD2558B2E"   // ChromeVox
     ]
   }]
 }