Move FiftythreeBitOverflowError to VM-only patch file.

sdk/lib/core/errors.dart

 // Copyright (c) 2012, 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 dart.core;
 
 class Error {
   const Error();
 
   /**
@@ skipping 217 matching lines @@
   const OutOfMemoryError();
   String toString() => "Out of Memory";
 }
 
 
 class StackOverflowError implements Error {
   const StackOverflowError();
   String toString() => "Stack Overflow";
 }
 
-class FiftyThreeBitOverflowError implements Error {
-  final Object value;
-
-  const FiftyThreeBitOverflowError(this.value);
-  String toString() => "53-bit Overflow: $value";
-}
-
 /**
  * Error thrown when a lazily initialized variable cannot be initialized.
  *
  * A static/library variable with an initializer expression is initialized
  * the first time it is read. If evaluating the initializer expression causes
  * another read of the variable, this error is thrown.
  */
 class CyclicInitializationError implements Error {
   final String variableName;
   const CyclicInitializationError([this.variableName]);
   String toString() => variableName == null
       ? "Reading static variable during its initialization"
       : "Reading static variable '$variableName' during its initialization";
 }