Implemented 'Reset Search engines' feature.

chrome/browser/search_engines/template_url_service.h

Index: chrome/browser/search_engines/template_url_service.h
diff --git a/chrome/browser/search_engines/template_url_service.h b/chrome/browser/search_engines/template_url_service.h
index 13bb8d9831e0ce7dd0f13923897ab343242f1d34..964b3588a71f89df95cf381863bebca6570ceffa 100644
--- a/chrome/browser/search_engines/template_url_service.h
+++ b/chrome/browser/search_engines/template_url_service.h
@@ -216,6 +216,13 @@ class TemplateURLService : public WebDataServiceConsumer,
   // NOTE: At least in unittest mode, this may return NULL.
   TemplateURL* GetDefaultSearchProvider();
 
+  // Clears user preferences describing the default search engine.
+  void ClearDefaultProviderFromPrefs();
+
+  // Clears non-extension URLs and reloads again prepopulated engines.
+  // Resets the default engine unless it's managed.
+  bool ResetNonExtensionURLs();
+
   // Returns true if the default search is managed through group policy.
   bool is_default_search_managed() const { return is_default_search_managed_; }
 
@@ -582,6 +589,18 @@ class TemplateURLService : public WebDataServiceConsumer,
 
   void OnSyncedDefaultSearchProviderGUIDChanged();
 
+  // Adds |*template_urls| to |template_urls_| and sets up default search
+  // provider according to the internal logic.
+  // |template_urls| comes from database.
+  // |default_search_provider| specifies URL inside |*template_urls|.
+  void AddTemplateURLsAndSetupDefaultEngine(
+      TemplateURLVector* template_urls,

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

pass as const-ref or indicate that this is an optional parameter that may be
NULL? (dito for the following paramter).

Please indicate whether you transfer the ownership of elements in
|template_urls|.

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

The method consumes |template_urls| and modifies it internally.

+      TemplateURL* default_search_provider);
+
+  // This sets the default search engine to FindNewDefaultSearchProvider(),
+  // if it's unmanaged and NULL.
+  void EnsureDefaultSearchProviderExists();
+
   content::NotificationRegistrar notification_registrar_;
   PrefChangeRegistrar pref_change_registrar_;