Fix calling object methods and properties on function types

pkg/analyzer/lib/src/summary/summary_sdk.dart

Index: pkg/analyzer/lib/src/summary/summary_sdk.dart
diff --git a/pkg/analyzer/lib/src/summary/summary_sdk.dart b/pkg/analyzer/lib/src/summary/summary_sdk.dart
index 92b4e48381ff40ecbb9035f325598c18c7d09ab9..d204794e0578c02e37067e7dea146d9fe952bd90 100644
--- a/pkg/analyzer/lib/src/summary/summary_sdk.dart
+++ b/pkg/analyzer/lib/src/summary/summary_sdk.dart
@@ -189,7 +189,9 @@ class SummaryBasedDartSdk implements DartSdk {
  * Implementation of [TypeProvider] which can be initialized separately with
  * `dart:core` and `dart:async` libraries.
  */
-class SummaryTypeProvider implements TypeProvider {
+class SummaryTypeProvider extends Object
+    with TypeProviderBaseMixin
+    implements TypeProvider {
   LibraryElement _coreLibrary;
   LibraryElement _asyncLibrary;
 
@@ -307,16 +309,6 @@ class SummaryTypeProvider implements TypeProvider {
   }
 
   @override
-  List<InterfaceType> get nonSubtypableTypes => <InterfaceType>[
-        nullType,
-        numType,
-        intType,
-        doubleType,
-        boolType,
-        stringType
-      ];
-
-  @override
   DartObjectImpl get nullObject {
     if (_nullObject == null) {
       _nullObject = new DartObjectImpl(nullType, NullState.NULL_STATE);