Merge CoreTypes and CoreClasses into CommonElements.

pkg/compiler/lib/src/js_backend/no_such_method_registry.dart

Index: pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
diff --git a/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart b/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
index a318872854a665289dbe99a1d979b52c043544cc..00b9ac7cda92327babbeae25613155c50fdab63b 100644
--- a/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
+++ b/pkg/compiler/lib/src/js_backend/no_such_method_registry.dart
@@ -187,7 +187,7 @@ class NoSuchMethodRegistry {
 
   bool isDefaultNoSuchMethodImplementation(FunctionElement element) {
     ClassElement classElement = element.enclosingClass;
-    return classElement == _compiler.coreClasses.objectClass ||
+    return classElement == _compiler.commonElements.objectClass ||
         classElement == _backend.helpers.jsInterceptorClass ||
         classElement == _backend.helpers.jsNullClass;
   }