Remove some summary TODOs that have already been addressed.

pkg/analyzer/tool/summary/idl.dart

Index: pkg/analyzer/tool/summary/idl.dart
diff --git a/pkg/analyzer/tool/summary/idl.dart b/pkg/analyzer/tool/summary/idl.dart
index 723cfc834d816048db5448a6da536f6f5cf7dcfb..5db8fe2f8d93d7e6ad36686db8f659d4a14dd01c 100644
--- a/pkg/analyzer/tool/summary/idl.dart
+++ b/pkg/analyzer/tool/summary/idl.dart
@@ -1165,9 +1165,6 @@ class UnlinkedPart {
  * Unlinked summary information about a specific name contributed by a
  * compilation unit to a library's public namespace.
  *
- * TODO(paulberry): add a count of generic parameters, so that resynthesis
- * doesn't have to peek into the library to obtain this info.
- *
  * TODO(paulberry): some of this information is redundant with information
  * elsewhere in the summary.  Consider reducing the redundancy to reduce
  * summary size.