Fix most implementations of UriResolver.restoreAbsolute.

pkg/analysis_server/test/context_manager_test.dart

 // Copyright (c) 2014, 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.
 
 library test.context.directory.manager;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 1617 matching lines @@
 
   @override
   AnalysisContext addContext(Folder folder, FolderDisposition disposition) {
     String path = folder.path;
     expect(currentContextPaths, isNot(contains(path)));
     currentContextTimestamps[path] = now;
     currentContextFilePaths[path] = <String, int>{};
     currentContextSources[path] = new HashSet<Source>();
     currentContextDispositions[path] = disposition;
     currentContext = AnalysisEngine.instance.createAnalysisContext();
-    List<UriResolver> resolvers = [new FileUriResolver()];
+    List<UriResolver> resolvers = [];
     resolvers.addAll(disposition.createPackageUriResolvers(resourceProvider));
+    resolvers.add(new FileUriResolver());
     currentContext.sourceFactory =
         new SourceFactory(resolvers, disposition.packages);
     return currentContext;
   }
 
   @override
   void applyChangesToContext(Folder contextFolder, ChangeSet changeSet) {
     Map<String, int> filePaths = currentContextFilePaths[contextFolder.path];
     Set<Source> sources = currentContextSources[contextFolder.path];
 
@@ skipping 68 matching lines @@
 class TestUriResolver extends UriResolver {
   Map<Uri, Source> uriMap;
 
   TestUriResolver(this.uriMap);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     return uriMap[uri];
   }
 }