Fix dart2dart and dart2js build.

lib/compiler/implementation/resolver.dart

Index: lib/compiler/implementation/resolver.dart
diff --git a/lib/compiler/implementation/resolver.dart b/lib/compiler/implementation/resolver.dart
index ea7e5fc72bac36ecc8cfa6a32051041f58985ee3..1123f73bbf598d1d218ab15e9f4c3f7c29bc8374 100644
--- a/lib/compiler/implementation/resolver.dart
+++ b/lib/compiler/implementation/resolver.dart
@@ -2338,11 +2338,11 @@ class ConstructorResolver extends CommonResolverVisitor<Element> {
         fullConstructorName = '$fullConstructorName'
                               '.${constructorName.slowToString()}';
       }
-      ResolutionWarning message  =
+      ResolutionWarning warning  =
           new ResolutionWarning(MessageKind.CANNOT_FIND_CONSTRUCTOR,
                                 [fullConstructorName]);
-      compiler.reportWarning(diagnosticNode, message);
-      return new ErroneousFunctionElement(message, cls);
+      compiler.reportWarning(diagnosticNode, warning);
+      return new ErroneousFunctionElement(warning.message, cls);
     }
     return result;
   }