[Doodle] Don't refresh more than once per 15 mins

chrome/browser/doodle/doodle_service_factory.cc

Index: chrome/browser/doodle/doodle_service_factory.cc
diff --git a/chrome/browser/doodle/doodle_service_factory.cc b/chrome/browser/doodle/doodle_service_factory.cc
index 85514239f46c6d5f2121e235452a40081321a084..06cc623b75e4b73aa5aadd9d55695e9407538fb3 100644
--- a/chrome/browser/doodle/doodle_service_factory.cc
+++ b/chrome/browser/doodle/doodle_service_factory.cc
@@ -62,5 +62,6 @@ KeyedService* DoodleServiceFactory::BuildServiceInstanceFor(
   return new doodle::DoodleService(profile->GetPrefs(), std::move(fetcher),
                                    base::MakeUnique<base::OneShotTimer>(),
                                    base::MakeUnique<base::DefaultClock>(),
-                                   base::MakeUnique<base::DefaultTickClock>());
+                                   base::MakeUnique<base::DefaultTickClock>(),
+                                   /*min_refresh_interval=*/base::nullopt);
 }