Apps that don't appear on the NTP shouldn't contribute to NTP page overflow.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index f4f799791e6273af78a5dc1d0ed19ea91bacc285..41ec751f519bd486ee8038abc4ee7dfec31a9b59 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -2102,6 +2102,10 @@ void ExtensionService::AddExtension(const Extension* extension) {
     // All apps that are displayed in the launcher are ordered by their ordinals
     // so we must ensure they have valid ordinals.
     if (extension->RequiresSortOrdinal()) {
+      if (!extension->ShouldDisplayInNewTabPage()) {
+        extension_prefs_->extension_sorting()->MarkExtensionAsHidden(
+            extension->id());
+      }
       extension_prefs_->extension_sorting()->EnsureValidOrdinals(
           extension->id(), syncer::StringOrdinal());
     }