Add UNDEFINED_HIDDEN_NAME, UNDEFINED_SHOWN_NAME

pkg/analyzer/test/generated/non_error_resolver_test.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.test.generated.non_error_resolver_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ skipping 5563 matching lines @@
 class B extends A<List> {
   m() {
     element.last;
   }
 }''');
     computeLibrarySourceErrors(source);
     assertNoErrors(source);
     verify([source]);
   }
 
-  void test_undefinedIdentifier_hide() {
-    Source source = addSource(r'''
-library L;
-export 'lib1.dart' hide a;''');
-    addNamedSource("/lib1.dart", "library lib1;");
-    computeLibrarySourceErrors(source);
-    assertNoErrors(source);
-    verify([source]);
-  }
-
-  void test_undefinedIdentifier_show() {
-    Source source = addSource(r'''
-library L;
-export 'lib1.dart' show a;''');
-    addNamedSource("/lib1.dart", "library lib1;");
-    computeLibrarySourceErrors(source);
-    assertNoErrors(source);
-    verify([source]);
-  }
-
   void test_undefinedIdentifier_synthetic_whenExpression() {
     Source source = addSource(r'''
 print(x) {}
 main() {
   print(is String);
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [ParserErrorCode.MISSING_IDENTIFIER]);
   }
 
@@ skipping 474 matching lines @@
     reset();
   }
 
   void _check_wrongNumberOfParametersForOperator1(String name) {
     _check_wrongNumberOfParametersForOperator(name, "a");
   }
 
   CompilationUnit _getResolvedLibraryUnit(Source source) =>
       analysisContext.getResolvedCompilationUnit2(source, source);
 }