Don't report TODO in analyzer_experimental.

pkg/analyzer_experimental/lib/src/generated/parser.dart

Index: pkg/analyzer_experimental/lib/src/generated/parser.dart
diff --git a/pkg/analyzer_experimental/lib/src/generated/parser.dart b/pkg/analyzer_experimental/lib/src/generated/parser.dart
index 89069e377e4fe59e88338bc41ad7d9ede63314dd..226497237163c9f8d316d424e16ad83debed8a33 100644
--- a/pkg/analyzer_experimental/lib/src/generated/parser.dart
+++ b/pkg/analyzer_experimental/lib/src/generated/parser.dart
@@ -4861,7 +4861,8 @@ class Parser {
     if (matcher.find()) {
       int offset = commentToken.offset + matcher.start() + matcher.group(1).length;
       int length = matcher.group(2).length;
-      _errorListener.onError(new AnalysisError.con2(_source, offset, length, TodoCode.TODO, [matcher.group(2)]));
+      // TODO(scheglov) analyzer_experimental users don't expect it
+//      _errorListener.onError(new AnalysisError.con2(_source, offset, length, TodoCode.TODO, [matcher.group(2)]));
     }
   }