Implemented 'Reset Search engines' feature.

chrome/browser/search_engines/template_url_prepopulate_data.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_PREPOPULATE_DATA_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_PREPOPULATE_DATA_H_
 
 #include <stddef.h>
 #include <string>
 #include <vector>
@@ skipping 36 matching lines @@
 int GetDataVersion(PrefService* prefs);
 
 // Loads the set of TemplateURLs from the prepopulate data.  Ownership of the
 // TemplateURLs is passed to the caller.  On return,
 // |default_search_provider_index| is set to the index of the default search
 // provider.
 void GetPrepopulatedEngines(Profile* profile,
                             std::vector<TemplateURL*>* t_urls,
                             size_t* default_search_provider_index);
 
+// Removes prepopulated engines stored in user prefs and overwrites its version.

[battre, 2013/05/22 14:03:37]

what does "its" refer to?

[vasilii, 2013/05/22 18:54:08]

Done.

+void ClearPrepopulatedEnginesInPrefs(Profile* profile);
+
 // Returns the default search provider specified by the prepopulate data.
 // The caller owns the returned value, which may be NULL.
 // If |profile| is NULL, any search provider overrides from the preferences are
 // not used.
 TemplateURL* GetPrepopulatedDefaultSearch(Profile* profile);
 
 // Returns the type of the matching engine, or SEARCH_ENGINE_OTHER if no engines
 // match.  This uses same-origin checks unless the |url| is a Google seach URL,
 // in which case we'll identify any valid Google hostname as "Google".
 //
 // NOTE: Must be called on the UI thread.
 SearchEngineType GetEngineType(const std::string& url);
 
 // Returns the logo at the specified |size| for |template_url|.  If no logo is
 // known, this will return an empty GURL.
 //
 // NOTE: Must be called on the UI thread.
 GURL GetLogoURL(const TemplateURL& template_url, LogoSize size);
 
 }  // namespace TemplateURLPrepopulateData
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_PREPOPULATE_DATA_H_