Delete unused readFunction.

pkg/compiler/lib/src/js_emitter/old_emitter/reflection_data_parser.dart

 // Copyright (c) 2013, 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.
 
 part of dart2js.js_emitter;
 
 // TODO(ahe): Share these with js_helper.dart.
 const FUNCTION_INDEX = 0;
 const NAME_INDEX = 1;
 const CALL_NAME_INDEX = 2;
@@ skipping 367 matching lines @@
       array, index, 'result != null && typeof result != "string"', 'string');
 }
 
 String readInt(String array, String index) {
   return readChecked(
       array, index,
       'result != null && (typeof result != "number" || (result|0) !== result)',
       'int');
 }
 
-String readFunction(String array, String index) {
-  return readChecked(
-      array, index, 'result != null && typeof result != "function"',
-      'function');
-}
-
 String readFunctionType(String array, String index) {
   return readChecked(
       array, index,
       'result != null && '
       '(typeof result != "number" || (result|0) !== result) && '
       'typeof result != "function"',
       'function or int');
 }
 
 String readChecked(String array, String index, String check, String type) {
   if (!VALIDATE_DATA) return '$array[$index]';
   return '''
 (function() {
   var result = $array[$index];
   if ($check) {
     throw new Error(
         name + ": expected value of type \'$type\' at index " + ($index) +
         " but got " + (typeof result));
   }
   return result;
 })()''';
 }