Revert of Make extensions DSE persistent in browser prefs

components/search_engines/template_url_service.h

 // 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.
 
 #ifndef COMPONENTS_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_H_
 #define COMPONENTS_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_H_
 
 #include <stddef.h>
 
 #include <list>
@@ skipping 690 matching lines @@
   TemplateURL* FindPrepopulatedTemplateURL(int prepopulated_id);
 
   // Returns the TemplateURL associated with |extension_id|, if any.
   TemplateURL* FindTemplateURLForExtension(const std::string& extension_id,
                                            TemplateURL::Type type);
 
   // Finds the extension-supplied TemplateURL that matches |data|, if any.
   TemplateURL* FindMatchingExtensionTemplateURL(const TemplateURLData& data,
                                                 TemplateURL::Type type);
 
+  // Finds the most recently-installed NORMAL_CONTROLLED_BY_EXTENSION engine
+  // that supports replacement and wants to be default, if any. Notifies the
+  // DefaultSearchManager, which might change the effective default search
+  // engine.
+  void UpdateExtensionDefaultSearchEngine();
+
+
   // ---------- Browser state related members ---------------------------------
   PrefService* prefs_;
 
   std::unique_ptr<SearchTermsData> search_terms_data_;
 
   // ---------- Dependencies on other components ------------------------------
   // Service used to store entries.
   scoped_refptr<KeywordWebDataService> web_data_service_;
 
   std::unique_ptr<TemplateURLServiceClient> client_;
@@ skipping 105 matching lines @@
   // Helper class to manage the default search engine.
   DefaultSearchManager default_search_manager_;
 
   std::unique_ptr<GoogleURLTracker::Subscription>
       google_url_updated_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(TemplateURLService);
 };
 
 #endif  // COMPONENTS_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_H_