Remove ExecutableElement.labels usages in tests.

pkg/analyzer/test/generated/resolver_test.dart

Index: pkg/analyzer/test/generated/resolver_test.dart
diff --git a/pkg/analyzer/test/generated/resolver_test.dart b/pkg/analyzer/test/generated/resolver_test.dart
index 691e21ede5701b1897d9dad9f667f8cea4470a6d..e9af0925d3242bd55fb829af02d6104ef8bb153a 100644
--- a/pkg/analyzer/test/generated/resolver_test.dart
+++ b/pkg/analyzer/test/generated/resolver_test.dart
@@ -3132,7 +3132,6 @@ A v = new A();
     expect(constructor.isSynthetic, isTrue);
     expect(constructor.name, 'c1');
     expect(constructor.functions, hasLength(0));
-    expect(constructor.labels, hasLength(0));
     expect(constructor.parameters, isEmpty);
   }
 
@@ -3162,7 +3161,6 @@ A v = new A();
     expect(constructor.isSynthetic, isTrue);
     expect(constructor.name, '');
     expect(constructor.functions, hasLength(0));
-    expect(constructor.labels, hasLength(0));
     expect(constructor.parameters, hasLength(1));
     expect(constructor.parameters[0].type, equals(classT.type));
     expect(constructor.parameters[0].name,
@@ -3192,7 +3190,6 @@ A v = new A();
     expect(constructor.isSynthetic, isTrue);
     expect(constructor.name, '');
     expect(constructor.functions, hasLength(0));
-    expect(constructor.labels, hasLength(0));
     expect(constructor.parameters, isEmpty);
   }