Don't assume that we always have a HowToFix and remove failing test.

pkg/compiler/lib/src/diagnostics/generated/shared_messages.dart

 // Copyright (c) 2015, 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.
 /*
 DON'T EDIT. GENERATED. DON'T EDIT.
 This file has been generated by 'publish.dart' in the dart_messages package.
 
 Messages are maintained in `lib/shared_messages.dart` of that same package.
 After any change to that file, run `bin/publish.dart` to generate a new version
 of the json, dart2js and analyzer representations.
@@ skipping 175 matching lines @@
     MessageKind.UNDEFINED_SUPER_SETTER,
     "The setter '#{memberName}' is not defined in a superclass of '#{className}'.",
     examples: const [
       r"""
         class A {}
         class B extends A {
           foo() { super.x = 499; }
         }
         main() { new B().foo(); }
         """,
-      r"""
-        main() => new B().m();
-        class A {
-          get x => 1;
-        }
-        class B extends A {
-          m() { super.x = 2; }
-        }
-        """,
     ]
   ),  // Generated. Don't edit.
   MessageKind.UNDEFINED_STATIC_GETTER_BUT_SETTER: const MessageTemplate(
     MessageKind.UNDEFINED_STATIC_GETTER_BUT_SETTER,
     "Cannot resolve getter '#{name}'.",
     examples: const [
       "set foo(x) {}  main() { foo; }",
     ]
   ),  // Generated. Don't edit.
   MessageKind.UNDEFINED_STATIC_SETTER_BUT_GETTER: const MessageTemplate(
@@ skipping 17 matching lines @@
         """,
       r"""
         const x = 1;
         main() { x = 3; }
         """,
       "get foo => null  main() { foo = 5; }",
       "const foo = 0  main() { foo = 5; }",
     ]
   ),  // Generated. Don't edit.
 };