Fix duplicate insertions of default search providers into the Web Data database.

chrome/browser/search_engines/template_url_model.h

 // Copyright (c) 2011 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_TEMPLATE_URL_MODEL_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_MODEL_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 352 matching lines @@
 
   // Removes the keyword from the model. This deletes the supplied TemplateURL.
   // This fails if the supplied template_url is the default search provider.
   // Caller is responsible for notifying observers.
   void RemoveNoNotify(const TemplateURL* template_url);
 
   // Notify the observers that the model has changed.  This is done only if the
   // model is loaded.
   void NotifyObservers();
 
+  // Removes from the vector any template URL that was created because of
+  // policy.  These TemplateURLs are freed and removed from the database.
+  // Sets default_search_provider to NULL if it was one of them, unless it is
+  // the same as the current default from preferences and it is managed.
+  void RemoveProvidersCreatedByPolicy(
+      std::vector<TemplateURL*>* template_urls,
+      const TemplateURL** default_search_provider,
+      const TemplateURL* default_from_prefs);
+
   NotificationRegistrar registrar_;
 
   // Mapping from keyword to the TemplateURL.
   KeywordToTemplateMap keyword_to_template_map_;
 
   TemplateURLVector template_urls_;
 
   ObserverList<TemplateURLModelObserver> model_observers_;
 
   // Maps from host to set of TemplateURLs whose search url host is host.
@@ skipping 43 matching lines @@
   // increasing integer that is initialized from the database.
   TemplateURLID next_id_;
 
   // List of extension IDs waiting for Load to have keywords registered.
   std::vector<std::string> pending_extension_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(TemplateURLModel);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_MODEL_H_