Use relative URIs for core library part-of statements.

sdk/lib/core/function.dart

 // 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.
 
-part of dart.core;
+part of "core.dart";
 
 /**
  * The base class for all function types.
  *
  * A function value, or an instance of a class with a "call" method, is a
  * subtype of a function type, and as such, a subtype of [Function].
  */
 abstract class Function {
   /**
    * Dynamically call [function] with the specified arguments.
@@ skipping 41 matching lines @@
    *
    * Function expressions never give rise to equal function objects. Each time
    * a function expression is evaluated, it creates a new closure value that
    * is not known to be equal to other closures created by the same expression.
    *
    * Classes implementing `Function` by having a `call` method should have their
    * own `operator==` and `hashCode` depending on the object.
    */
   bool operator ==(Object other);
 }