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

pkg/kernel/lib/binary/ast_from_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_from_binary;
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import '../ast.dart';
 import '../transformations/flags.dart';
@@ skipping 669 matching lines @@
             readMemberReference(allowNull: true))..fileOffset = offset;
       case Tag.SuperPropertyGet:
         addTransformerFlag(TransformerFlag.superCalls);
         return new SuperPropertyGet.byReference(
             readName(), readMemberReference(allowNull: true));
       case Tag.SuperPropertySet:
         addTransformerFlag(TransformerFlag.superCalls);
         return new SuperPropertySet.byReference(
             readName(), readExpression(), readMemberReference(allowNull: true));
       case Tag.DirectPropertyGet:
-        int offset = readOffset();
         return new DirectPropertyGet.byReference(
-            readExpression(), readMemberReference())..fileOffset = offset;
+            readExpression(), readMemberReference());
       case Tag.DirectPropertySet:
-        int offset = readOffset();
         return new DirectPropertySet.byReference(
-            readExpression(), readMemberReference(), readExpression())
-          ..fileOffset = offset;
+            readExpression(), readMemberReference(), readExpression());
       case Tag.StaticGet:
         int offset = readOffset();
         return new StaticGet.byReference(readMemberReference())
           ..fileOffset = offset;
       case Tag.StaticSet:
         int offset = readOffset();
         return new StaticSet.byReference(
             readMemberReference(), readExpression())..fileOffset = offset;
       case Tag.MethodInvocation:
         int offset = readOffset();
@@ skipping 405 matching lines @@
       ..fileOffset = offset
       ..fileEqualsOffset = fileEqualsOffset;
   }
 
   int readOffset() {
     // Offset is saved as unsigned,
     // but actually ranges from -1 and up (thus the -1)
     return readUInt() - 1;
   }
 }