Remove element from DynamicType.

sdk/lib/_internal/compiler/implementation/inferrer/type_graph_inferrer.dart

Index: sdk/lib/_internal/compiler/implementation/inferrer/type_graph_inferrer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/inferrer/type_graph_inferrer.dart b/sdk/lib/_internal/compiler/implementation/inferrer/type_graph_inferrer.dart
index 53bea15a48c1eaef70aad167122b7c0163c56791..355ca78352819ae6c7db7404785dc6567f47c325 100644
--- a/sdk/lib/_internal/compiler/implementation/inferrer/type_graph_inferrer.dart
+++ b/sdk/lib/_internal/compiler/implementation/inferrer/type_graph_inferrer.dart
@@ -215,14 +215,13 @@ class TypeInformationSystem extends TypeSystem<TypeInformation> {
     if (annotation.isVoid) return nullType;
     if (annotation.element == compiler.objectClass) return type;
     TypeMask otherType;
-    if (annotation.kind == TypeKind.TYPEDEF ||
-        annotation.kind == TypeKind.FUNCTION) {
+    if (annotation.isTypedef || annotation.isFunctionType) {
       otherType = functionType.type;
-    } else if (annotation.kind == TypeKind.TYPE_VARIABLE) {
+    } else if (annotation.isTypeVariable) {
       // TODO(ngeoffray): Narrow to bound.
       return type;
     } else {
-      assert(annotation.kind == TypeKind.INTERFACE);
+      assert(annotation.isInterfaceType);
       otherType = new TypeMask.nonNullSubtype(annotation.element);
     }
     if (isNullable) otherType = otherType.nullable();