Fix issue 4361 by checking in the resolver if the getter/setter exists.

lib/compiler/implementation/warnings.dart

Index: lib/compiler/implementation/warnings.dart
===================================================================
--- lib/compiler/implementation/warnings.dart	(revision 11766)
+++ lib/compiler/implementation/warnings.dart	(working copy)
@@ -232,6 +232,12 @@
   static const PARAMETER_NAME_EXPECTED = const MessageKind(
       "Error: parameter name expected.");
 
+  static const CANNOT_RESOLVE_GETTER = const MessageKind(
+      'Cannot resolve getter.');

[kasperl, 2012/09/04 05:50:07]

Error: cannot ...

[ngeoffray, 2012/09/04 08:32:14]

Actually, we now get printed Error: Error :-( So we should remove all Error: and
Warning: from the MessageKind.

+
+  static const CANNOT_RESOLVE_SETTER = const MessageKind(
+      'Cannot resolve setter.');
+
   static const COMPILER_CRASHED = const MessageKind(
       "Error: The compiler crashed when compiling this element.");