Fix bogus comment on ClassHierarchy.forEachCrossOverridePair.

pkg/kernel/lib/class_hierarchy.dart

Index: pkg/kernel/lib/class_hierarchy.dart
diff --git a/pkg/kernel/lib/class_hierarchy.dart b/pkg/kernel/lib/class_hierarchy.dart
index f7c1f852f50feeb38c824316f0f9a7d7f51209c5..1c1554e36c6febc7383a64cbdbfe71770c212247 100644
--- a/pkg/kernel/lib/class_hierarchy.dart
+++ b/pkg/kernel/lib/class_hierarchy.dart
@@ -135,8 +135,8 @@ abstract class ClassHierarchy {
   /// may be reported multiple times when there are multiple inheritance paths
   /// to the overridden member.
   ///
-  /// By default getters and setters are overridden separately.  The [isSetter]
-  /// callback parameter corresponds to whether [declaredMember] is a setter.
+  /// The [isSetter] callback parameter corresponds to whether [declaredMember]
+  /// is a setter.
   void forEachCrossOverridePair(Class class_,
       callback(Member declaredMember, Member interfaceMember, bool isSetter));