Revert "[kernel] offsets on direct property get/set"

pkg/kernel/lib/binary/ast_to_binary.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.ast_to_binary;
 
 import '../ast.dart';
 import '../import_table.dart';
 import 'tag.dart';
 import 'dart:convert';
 import 'dart:typed_data';
@@ skipping 483 matching lines @@
 
   visitSuperPropertySet(SuperPropertySet node) {
     writeByte(Tag.SuperPropertySet);
     writeName(node.name);
     writeNode(node.value);
     writeReference(node.interfaceTargetReference);
   }
 
   visitDirectPropertyGet(DirectPropertyGet node) {
     writeByte(Tag.DirectPropertyGet);
-    writeOffset(node, node.fileOffset);
     writeNode(node.receiver);
     writeReference(node.targetReference);
   }
 
   visitDirectPropertySet(DirectPropertySet node) {
     writeByte(Tag.DirectPropertySet);
-    writeOffset(node, node.fileOffset);
     writeNode(node.receiver);
     writeReference(node.targetReference);
     writeNode(node.value);
   }
 
   visitStaticGet(StaticGet node) {
     writeByte(Tag.StaticGet);
     writeOffset(node, node.fileOffset);
     writeReference(node.targetReference);
   }
@@ skipping 761 matching lines @@
   void flush() {
     _sink.add(_buffer.sublist(0, length));
     _buffer = new Uint8List(SIZE);
     length = 0;
   }
 
   void flushAndDestroy() {
     _sink.add(_buffer.sublist(0, length));
   }
 }