Store default search provider data in dictionary pref.

chrome/browser/search_engines/template_url_service_factory.cc

Index: chrome/browser/search_engines/template_url_service_factory.cc
diff --git a/chrome/browser/search_engines/template_url_service_factory.cc b/chrome/browser/search_engines/template_url_service_factory.cc
index 43124af57863da7bd0f450d593d03860a08ad5ce..23dee2ddc8bd8bde241c734d41d0562a0cf97a5b 100644
--- a/chrome/browser/search_engines/template_url_service_factory.cc
+++ b/chrome/browser/search_engines/template_url_service_factory.cc
@@ -124,6 +124,10 @@ void TemplateURLServiceFactory::RegisterProfilePrefs(
       prefs::kDefaultSearchProviderSearchTermsReplacementKey,
       std::string(),
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  // TODO(caitkp): Set a default value here.

[erikwright (departed), 2014/04/22 15:47:24]

In fact, the default should simply be NULL based on our subsequent discussions.

[Cait (Slow), 2014/04/22 19:54:13]

Done.

+  registry->RegisterDictionaryPref(
+      prefs::kDefaultSearchProviderData,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 content::BrowserContext* TemplateURLServiceFactory::GetBrowserContextToUse(