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

chrome/browser/search_engines/util.h

Index: chrome/browser/search_engines/util.h
diff --git a/chrome/browser/search_engines/util.h b/chrome/browser/search_engines/util.h
index 2b43ce0177a08bdb93b99fb25a35f387549dd2a0..994c1027a470a55fdbbc621aa79427878ff8f701 100644
--- a/chrome/browser/search_engines/util.h
+++ b/chrome/browser/search_engines/util.h
@@ -81,21 +81,20 @@ ActionsFromPrepopulateData CreateActionsFromCurrentPrepopulateData(
 // 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);
 
@@ -110,7 +109,7 @@ 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);