Revert "Use relative URIs for core library part-of statements."

sdk/lib/collection/linked_hash_map.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 "collection.dart";
+part of dart.collection;
 
 /**
  * A hash-table based implementation of [Map].
  *
  * The insertion order of keys is remembered,
  * and keys are iterated in the order they were inserted into the map.
  * Values are iterated in their corresponding key's order.
  * Changing a key's value, when the key is already in the map,
  * does not change the iteration order,
  * but removing the key and adding it again
@@ skipping 110 matching lines @@
    * overwrites the previous value.
    *
    * It is an error if the two [Iterable]s don't have the same length.
    */
   factory LinkedHashMap.fromIterables(Iterable<K> keys, Iterable<V> values) {
     LinkedHashMap<K, V> map = new LinkedHashMap<K, V>();
     Maps._fillMapWithIterables(map, keys, values);
     return map;
   }
 }