Use relative URIs for core library part-of statements.

sdk/lib/core/invocation.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;
+part of "core.dart";
 
 /**
  * Representation of the invocation of a member on an object.
  *
  * This is the type of objects passed to [Object.noSuchMethod] when
  * an object doesn't support the member invocation that was attempted
  * on it.
  */
 abstract class Invocation {
   /** The name of the invoked member. */
@@ skipping 27 matching lines @@
    * Whether the invocation was a setter call.
    *
    * If so, [positionalArguments] has exactly one positional argument,
    * and [namedArguments] is empty.
    */
   bool get isSetter;
 
   /** Whether the invocation was a getter or a setter call. */
   bool get isAccessor => isGetter || isSetter;
 }