Remove irrelevant TODOs from summary code.

pkg/analyzer/lib/src/summary/idl.dart

Index: pkg/analyzer/lib/src/summary/idl.dart
diff --git a/pkg/analyzer/lib/src/summary/idl.dart b/pkg/analyzer/lib/src/summary/idl.dart
index 16f9e24212a8787712bd43c3ed5f69dbfaf4956c..b671751c71b08b0c3e0ab61d4fe2a13f5d295791 100644
--- a/pkg/analyzer/lib/src/summary/idl.dart
+++ b/pkg/analyzer/lib/src/summary/idl.dart
@@ -48,23 +48,10 @@ import 'format.dart' as generated;
  * Annotation describing information which is not part of Dart semantics; in
  * other words, if this information (or any information it refers to) changes,
  * static analysis and runtime behavior of the library are unaffected.
- *
- * TODO(paulberry): some informative information is currently missing from the
- * summary format.
  */
 const informative = null;
 
 /**
- * Annotation describing information which is not part of the public API to a
- * library; in other words, if this information (or any information it refers
- * to) changes, libraries outside this one are unaffected.
- *
- * TODO(paulberry): currently the summary format does not contain private
- * information.
- */
-const private = null;
-
-/**
  * Annotation describing a class which can be the top level object in an
  * encoded summary.
  */