Don't emit unused hints when there are compilation errors.

dart/tests/compiler/dart2js/diagnose_ambiguous_test.dart

Index: dart/tests/compiler/dart2js/diagnose_ambiguous_test.dart
diff --git a/dart/tests/compiler/dart2js/diagnose_ambiguous_test.dart b/dart/tests/compiler/dart2js/diagnose_ambiguous_test.dart
index fd12f2cb57ece9d1c2ed839cfa94ca5a0ec3c5df..5e93e2e29500ed1ef76b8d0c806ebcbd8e382a56 100644
--- a/dart/tests/compiler/dart2js/diagnose_ambiguous_test.dart
+++ b/dart/tests/compiler/dart2js/diagnose_ambiguous_test.dart
@@ -14,8 +14,6 @@ main() {
   Uri libraryRoot = script.resolve('../../../sdk/');
   Uri packageRoot = script.resolve('./packages/');
 
-  var unusedPattern = new RegExp("Hint: The method '.*' is never called\\.");
-
   var provider = new MemorySourceFileProvider(MEMORY_SOURCE_FILES);
   var diagnostics = [];
   void diagnosticHandler(Uri uri, int begin, int end,
@@ -23,9 +21,6 @@ main() {
     if (kind == Diagnostic.VERBOSE_INFO) {
       return;
     }
-    if (message.startsWith(unusedPattern)) {
-      return;
-    }
     diagnostics.add('$uri:$begin:$end:$message:$kind');
   }