Use the DefaultSearchManager as the exclusive authority on DSE, ignoring Web Data.

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 63 matching lines @@
 // NOTE: Takes ownership of, and clears, |prepopulated_urls|.
 ActionsFromPrepopulateData CreateActionsFromCurrentPrepopulateData(
     ScopedVector<TemplateURLData>* prepopulated_urls,
     const TemplateURLService::TemplateURLVector& existing_urls,
     const TemplateURL* default_search_provider);
 
 // Processes the results of WebDataService::GetKeywords, combining it with
 // prepopulated search providers to result in:
 //  * a set of template_urls (search providers). The caller owns the
 //    TemplateURL* returned in template_urls.
-//  * the default search provider (and if *default_search_provider is not NULL,
-//    it is contained in template_urls).
 //  * whether there is a new resource keyword version (and the value).
 //    |*new_resource_keyword_version| is set to 0 if no new value. Otherwise,
 //    it is the new value.
 // Only pass in a non-NULL value for service if the WebDataService should be
 // updated. If |removed_keyword_guids| is not NULL, any TemplateURLs removed
 // from the keyword table in the WebDataService will have their Sync GUIDs
-// added to it.
+// added to it. |default_search_provider| will be used to prevent removing the
+// current user-selected DSE, regardless of changes in prepopulate data.
 void GetSearchProvidersUsingKeywordResult(
     const WDTypedResult& result,
     WebDataService* service,
     Profile* profile,
     TemplateURLService::TemplateURLVector* template_urls,
-    TemplateURL** default_search_provider,
+    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.
 // |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().
 void GetSearchProvidersUsingLoadedEngines(
     WebDataService* service,
     Profile* profile,
     TemplateURLService::TemplateURLVector* template_urls,
-    TemplateURL** default_search_provider,
+    TemplateURL* default_search_provider,
     int* 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<TemplateURLData>& prepopulated_urls,
     TemplateURL* default_search_provider,
     TemplateURLService::TemplateURLVector* template_urls,
     std::set<std::string>* removed_keyword_guids);
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_UTIL_H_