Fix member overriding rules in VM according to latest spec.

runtime/vm/object.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "vm/assert.h"
 #include "vm/dart.h"
 #include "vm/globals.h"
@@ skipping 1298 matching lines @@
 
   static intptr_t value_offset() { return OFFSET_OF(RawField, value_); }
 
   intptr_t token_index() const { return raw_ptr()->token_index_; }
 
   bool has_initializer() const { return raw_ptr()->has_initializer_; }
   void set_has_initializer(bool has_initializer) const {
     raw_ptr()->has_initializer_ = has_initializer;
   }
 
-  // Constructs getter and setter names for fields.
+  // Constructs getter and setter names for fields and vice versa.
   static RawString* GetterName(const String& field_name);
   static RawString* SetterName(const String& field_name);
+  static RawString* NameFromGetter(const String& getter_name);
+  static RawString* NameFromSetter(const String& setter_name);
 
  private:
   void set_name(const String& value) const;
   void set_is_static(bool is_static) const {
     raw_ptr()->is_static_ = is_static;
   }
   void set_is_final(bool is_final) const {
     raw_ptr()->is_final_ = is_final;
   }
   void set_token_index(intptr_t token_index) const {
@@ skipping 1602 matching lines @@
 }
 
 
 void Context::SetAt(intptr_t index, const Instance& value) const {
   StorePointer(InstanceAddr(index), value.raw());
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_