Implemented 'Reset Search engines' feature.

chrome/browser/search_engines/template_url_service.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_TEMPLATE_URL_SERVICE_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 207 matching lines @@
 
   // Returns true if the default search is managed through group policy.
   bool is_default_search_managed() const { return is_default_search_managed_; }
 
   // Returns the default search specified in the prepopulated data, if it
   // exists.  If not, returns first URL in |template_urls_|, or NULL if that's
   // empty. The returned object is owned by TemplateURLService and can be
   // destroyed at any time so should be used right after the call.
   TemplateURL* FindNewDefaultSearchProvider();
 
+  // Resets the search providers to the prepopulated engines plus any
+  // extension-supplied engines.  Also resets the default search engine unless
+  // it's managed.
+  void ResetNonExtensionURLs();
+
   // Observers used to listen for changes to the model.
   // TemplateURLService does NOT delete the observers when deleted.
   void AddObserver(TemplateURLServiceObserver* observer);
   void RemoveObserver(TemplateURLServiceObserver* observer);
 
   // Loads the keywords. This has no effect if the keywords have already been
   // loaded.
   // Observers are notified when loading completes via the method
   // OnTemplateURLServiceChanged.
   void Load();
@@ skipping 176 matching lines @@
   // Creates a TemplateURL that was previously saved to prefs via
   // SaveDefaultSearchProviderToPrefs or set via policy.
   // Returns true if successful, false otherwise.
   // If the user or the policy has opted for no default search, this
   // returns true but default_provider is set to NULL.
   // |*is_managed| specifies whether the default is managed via policy.
   bool LoadDefaultSearchProviderFromPrefs(
       scoped_ptr<TemplateURL>* default_provider,
       bool* is_managed);
 
+  // Clears user preferences describing the default search engine.
+  void ClearDefaultProviderFromPrefs();
+
   // Returns true if there is no TemplateURL that has a search url with the
   // specified host, or the only TemplateURLs matching the specified host can
   // be replaced.
   bool CanReplaceKeywordForHost(const std::string& host,
                                 TemplateURL** to_replace);
 
   // Returns true if the TemplateURL is replaceable. This doesn't look at the
   // uniqueness of the keyword or host and is intended to be called after those
   // checks have been done. This returns true if the TemplateURL doesn't appear
   // in the default list and is marked as safe_for_autoreplace.
@@ skipping 141 matching lines @@
   // NULL if there was no pending search provider from Sync.
   TemplateURL* GetPendingSyncedDefaultSearchProvider();
 
   // Goes through a vector of TemplateURLs and ensure that both the in-memory
   // and database copies have valid sync_guids. This is to fix crbug.com/102038,
   // where old entries were being pushed to Sync without a sync_guid.
   void PatchMissingSyncGUIDs(TemplateURLVector* template_urls);
 
   void OnSyncedDefaultSearchProviderGUIDChanged();
 
+  // Adds |template_urls| to |template_urls_| and sets up the default search
+  // provider.  If |default_search_provider| is non-NULL, it must refer to one
+  // of the |template_urls|, and will be used as the new default.
+  void AddTemplateURLsAndSetupDefaultEngine(
+      TemplateURLVector* template_urls,
+      TemplateURL* default_search_provider);
+
+  // If there is no current default search provider, sets the default to the
+  // result of calling FindNewDefaultSearchProvider().
+  void EnsureDefaultSearchProviderExists();
+
   content::NotificationRegistrar notification_registrar_;
   PrefChangeRegistrar pref_change_registrar_;
 
   // Mapping from keyword to the TemplateURL.
   KeywordToTemplateMap keyword_to_template_map_;
 
   // Mapping from Sync GUIDs to the TemplateURL.
   GUIDToTemplateMap guid_to_template_map_;
 
   TemplateURLVector template_urls_;
@@ skipping 75 matching lines @@
 
   // This is used to log the origin of changes to the default search provider.
   // We set this value to increasingly specific values when we know what is the
   // cause/origin of a default search change.
   DefaultSearchChangeOrigin dsp_change_origin_;
 
   DISALLOW_COPY_AND_ASSIGN(TemplateURLService);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_H_