Fix bogus comment on ClassHierarchy.forEachCrossOverridePair.

pkg/kernel/lib/class_hierarchy.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library kernel.class_hierarchy;
 
 import 'ast.dart';
 import 'dart:math';
 import 'dart:typed_data';
 import 'src/heap.dart';
 import 'type_algebra.dart';
@@ skipping 117 matching lines @@
   /// mixin application are those declared in the mixed-in type. The callback is
   /// invoked in the following case:
   ///
   /// A member declared in the class overrides a member inheritable through
   /// one of the supertypes of the class.
   ///
   /// This method will not report that a member overrides itself. A given pair
   /// 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));
 
   /// This method is invoked by the client after it changed the [classes], and
   /// some of the information that this hierarchy might have cached, is not
   /// valid anymore. The hierarchy may perform required updates and return the
   /// same instance, or return a new instance.
   ClassHierarchy applyChanges(Iterable<Class> classes);
 }
 
@@ skipping 1018 matching lines @@
 class _LubHeap extends Heap<_ClassInfo> {
   @override
   bool sortsBefore(_ClassInfo a, _ClassInfo b) => sortsBeforeStatic(a, b);
 
   static bool sortsBeforeStatic(_ClassInfo a, _ClassInfo b) {
     if (a.depth > b.depth) return true;
     if (a.depth < b.depth) return false;
     return a.topologicalIndex < b.topologicalIndex;
   }
 }