Implemented 'Reset Search engines' feature.

chrome/browser/search_engines/template_url_prepopulate_data.cc

Index: chrome/browser/search_engines/template_url_prepopulate_data.cc
diff --git a/chrome/browser/search_engines/template_url_prepopulate_data.cc b/chrome/browser/search_engines/template_url_prepopulate_data.cc
index 235f621966a62123151a531121ec714b2b6dfccf..83e7a8132dbf28b81bd7cf0582cd04d193fadf37 100644
--- a/chrome/browser/search_engines/template_url_prepopulate_data.cc
+++ b/chrome/browser/search_engines/template_url_prepopulate_data.cc
@@ -1197,6 +1197,22 @@ void GetPrepopulatedTemplateFromPrefs(Profile* profile,
   }
 }
 
+void ClearPrepopulatedEnginesInPrefs(Profile* profile) {
+  if (!profile)
+    return;
+
+  PrefService* prefs = profile->GetPrefs();
+  DCHECK(prefs);
+  const PrefService::Preference* pref =
+      prefs->FindPreference(prefs::kSearchProviderOverrides);
+  if (pref && pref->HasUserSetting()) {
+    ListValue empty_list;
+    prefs->Set(prefs::kSearchProviderOverrides, empty_list);

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

Should we use prefs->ClearPref here and in the following line? 

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

Done.

+    prefs->SetInteger(prefs::kSearchProviderOverridesVersion,
+                      kCurrentDataVersion);
+  }
+}
+
 // The caller owns the returned TemplateURL.
 TemplateURL* MakePrepopulatedTemplateURLFromPrepopulateEngine(
     Profile* profile,