- Fix the external_test.dart as it was relying on outdated

tests/language/language_analyzer.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == dartanalyzer ]
 # Runtime negative test. No static errors or warnings.
 closure_call_wrong_argument_count_negative_test: skip
 
 # Test issue 12694 (was analyzer issue), (1) when "abstract" is import prefix using it as type is warning; (2) currently analyzer resolves prefix as field (don't ask)
 built_in_identifier_prefix_test: CompileTimeError # Issue 12694
 
 # TBF: we should check conflicts not only for methods, but for accessors too
 override_field_test/03: fail
 method_override7_test/03: Fail # Issue 11496
 
 type_check_const_function_typedef2_test/00: MissingCompileTimeError, Ok # Compile-time error in checked mode, because of constants.
 
+external_test/21: Fail
+external_test/24: Fail
+external_test/25: Fail
+
 # Please add new failing tests before this line.
 # Section below is for invalid tests.
 #
 #
 
 ref_before_declaration_test/none: fail # test issue 14879, "P" is not defined
 bad_initializer2_negative_test: fail # Issue 14880, Analyzer reports compile-time error, but test runner is not satisfied
 
 # test issue 11124, It is warning, not error to don't initialize final field
 field3a_negative_test: Fail # Issue 11124
@@ skipping 133 matching lines @@
 
 # The following tests are currently assumed to be failing because the test is wrong.
 #
 application_negative_test: CompileTimeError # Test Issue 14528
 bad_constructor_test/05: CompileTimeError # Test Issue 5337
 bad_initializer1_negative_test: CompileTimeError # Test Issue 14529
 bad_named_constructor_negative_test: CompileTimeError # Test Issue 18693
 body_less_constructor_wrong_arg_negative_test: CompileTimeError # Test Issue 18695
 empty_block_case_test: StaticWarning # Test Issue 18701
 error_stacktrace_test: StaticWarning # Test Issue 18702
-external_test/20: StaticWarning # Test Issue 18703
 
 const_counter_negative_test: CompileTimeError
 const_optional_args_negative_test: CompileTimeError
 constructor_redirect1_negative_test: CompileTimeError
 constructor_redirect2_negative_test: CompileTimeError
 constructor_setter_negative_test: CompileTimeError
 duplicate_export_negative_test: CompileTimeError
 duplicate_interface_negative_test: CompileTimeError
 export_ambiguous_main_negative_test: CompileTimeError
 extend_type_parameter2_negative_test: CompileTimeError
@@ skipping 260 matching lines @@
 #deferred_not_loaded_check_test: Pass, Fail
 
 # Issues to be fixed now that type parameters have been fixed
 # (issues 14221, 15553)
 factory1_test/00: StaticWarning # Test Issue 18726
 factory1_test/01: StaticWarning # Test Issue 18726
 factory1_test/none: StaticWarning # Test Issue 18726
 generic_closure_test: StaticWarning
 local_function2_test: StaticWarning
 redirecting_factory_long_test: StaticWarning