Remove the protector service.

chrome/browser/search_engines/search_engine_type.h

 // 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.
 
 #ifndef CHROME_BROWSER_SEARCH_ENGINES_SEARCH_ENGINE_TYPE_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_SEARCH_ENGINE_TYPE_H_
 
 // Enum to record the user's default search engine choice in UMA.  Add new
 // search engines at the bottom and do not delete from this list, so as not
 // to disrupt UMA data already recorded.
@@ skipping 24 matching lines @@
   SEARCH_ENGINE_OK,
   SEARCH_ENGINE_POGODAK,
   SEARCH_ENGINE_POGODOK_MK,  // Defunct. Deletion would corrupt UMA stats.
   SEARCH_ENGINE_RAMBLER,
   SEARCH_ENGINE_SANOOK,
   SEARCH_ENGINE_SAPO,
   SEARCH_ENGINE_TUT,
   SEARCH_ENGINE_WALLA,
   SEARCH_ENGINE_ZOZNAM,
   SEARCH_ENGINE_YAHOOQC,
-  SEARCH_ENGINE_NONE,  // Used by Protector. Putting it at the beginning would
-                       // corrupt UMA stats. Add new search engines below.
+  SEARCH_ENGINE_NONE,  // Defunct. Deletion would corrupt UMA stats.
   SEARCH_ENGINE_CONDUIT,
   SEARCH_ENGINE_ALL_BY,
   SEARCH_ENGINE_APORT,
   SEARCH_ENGINE_ICQ,
   SEARCH_ENGINE_METABOT_RU,
   SEARCH_ENGINE_META_UA,
   SEARCH_ENGINE_NIGMA,
   SEARCH_ENGINE_QIP,
   SEARCH_ENGINE_UKR_NET,
   SEARCH_ENGINE_WEBALTA,
   SEARCH_ENGINE_AVG,
   SEARCH_ENGINE_MAX  // Bounding max value needed for UMA histogram macro.
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_SEARCH_ENGINE_TYPE_H_