Implemented 'Reset Search engines' feature.

chrome/browser/search_engines/util.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_UTIL_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_UTIL_H_
 
 // This file contains utility functions for search engine functionality.
 #include <set>
 #include <string>
@@ skipping 32 matching lines @@
 // added to it.
 void GetSearchProvidersUsingKeywordResult(
     const WDTypedResult& result,
     WebDataService* service,
     Profile* profile,
     TemplateURLService::TemplateURLVector* template_urls,
     TemplateURL** default_search_provider,
     int* new_resource_keyword_version,
     std::set<std::string>* removed_keyword_guids);
 
+// Like GetSearchProvidersUsingKeywordResult(), but allows the caller to pass in
+// engines in |template_urls| instead of getting them via processing a web data
+// service request.
+// |*new_resource_keyword_version| should contain current version of
+// |*template_urls|.

[Peter Kasting, 2013/05/29 04:04:41]

Nit: How about we name it |resource_keyword_version| and have the comment here
say:

|resource_keyword_version| should contain the version number of the current
keyword data, i.e. the version number of the most recent prepopulate data that
has been merged into the current keyword data.  On exit, this will be set as in
GetSearchProvidersUsingKeywordResult().

[vasilii, 2013/05/29 08:30:18]

Done.

+void GetSearchProvidersUsingLoadedEngines(
+    WebDataService* service,
+    Profile* profile,
+    TemplateURLService::TemplateURLVector* template_urls,
+    TemplateURL** default_search_provider,
+    int* new_resource_keyword_version,
+    std::set<std::string>* removed_keyword_guids);
+
 // Due to a bug, the |input_encodings| field of TemplateURLData could have
 // contained duplicate entries.  This removes those entries and returns whether
 // any were found.
 bool DeDupeEncodings(std::vector<std::string>* encodings);
 
 // Removes (and deletes) TemplateURLs from |template_urls| and |service| if they
 // have duplicate prepopulate ids. If |removed_keyword_guids| is not NULL, the
 // Sync GUID of each item removed from the DB will be added to it. This is a
 // helper used by GetSearchProvidersUsingKeywordResult(), but is declared here
 // so it's accessible by unittests.
 void RemoveDuplicatePrepopulateIDs(
     WebDataService* service,
     const ScopedVector<TemplateURL>& prepopulated_urls,
     TemplateURL* default_search_provider,
     TemplateURLService::TemplateURLVector* template_urls,
     std::set<std::string>* removed_keyword_guids);
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_UTIL_H_