Add baked-in favicons for default popular sites on NTP

components/ntp_tiles/popular_sites_impl_unittest.cc

Index: components/ntp_tiles/popular_sites_impl_unittest.cc
diff --git a/components/ntp_tiles/popular_sites_impl_unittest.cc b/components/ntp_tiles/popular_sites_impl_unittest.cc
index 6732e27cc0cca77c40ede17e986c36bc0622432b..fb616fc40e75170736a8ae3480fc853256404186 100644
--- a/components/ntp_tiles/popular_sites_impl_unittest.cc
+++ b/components/ntp_tiles/popular_sites_impl_unittest.cc
@@ -153,7 +153,8 @@ class PopularSitesTest : public ::testing::Test {
     return base::MakeUnique<PopularSitesImpl>(
         worker_pool_owner_.pool().get(), &prefs_,
         /*template_url_service=*/nullptr,
-        /*variations_service=*/nullptr, context, cache_dir_,
+        /*variations_service=*/nullptr,
+        /*favicon_service=*/nullptr, context, cache_dir_,
         base::Bind(JsonUnsafeParser::Parse));
   }