Implement LibraryElement.hasExtUri for resynthesized.

pkg/analyzer/test/generated/non_error_resolver_driver_test.dart

Index: pkg/analyzer/test/generated/non_error_resolver_driver_test.dart
diff --git a/pkg/analyzer/test/generated/non_error_resolver_driver_test.dart b/pkg/analyzer/test/generated/non_error_resolver_driver_test.dart
index efe4192a53bf0c6e63ecddd782497eef3bc21a9f..b18fe3201935ee0317f15ec09e16828b329070d3 100644
--- a/pkg/analyzer/test/generated/non_error_resolver_driver_test.dart
+++ b/pkg/analyzer/test/generated/non_error_resolver_driver_test.dart
@@ -16,16 +16,4 @@ main() {
 class NonErrorResolverTest_Driver extends NonErrorResolverTest {
   @override
   bool get enableNewAnalysisDriver => true;
-
-  @failingTest
-  @override
-  test_nativeConstConstructor() {
-    return super.test_nativeConstConstructor();
-  }
-
-  @failingTest
-  @override
-  test_nativeFunctionBodyInNonSDKCode_function() {
-    return super.test_nativeFunctionBodyInNonSDKCode_function();
-  }
 }