Update unit tests

dart/tests/try/poi/apply_updates_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.
 
 // Test of FunctionUpdate by pretty printing the updated element before and
 // after.
 library trydart.library_updater_test;
 
-import 'dart:convert' show
-    UTF8;
-
 import 'package:dart2js_incremental/library_updater.dart' show
     IncrementalCompilerContext,
     LibraryUpdater,
     Update;
 
 import 'package:compiler/src/scanner/scannerlib.dart' show
     PartialFunctionElement;
 
+import 'package:compiler/src/dart2jslib.dart' show
+    Script;
+
+import 'package:compiler/src/source_file.dart' show
+    StringSourceFile;
+
 import 'compiler_test_case.dart';
 
 import 'library_updater_test.dart' show
     LibraryUpdaterTestCase,
+    newScriptFrom,
     nolog;
 
 class ApplyUpdateTestCase extends LibraryUpdaterTestCase {
   final String expectedUpdate;
 
   ApplyUpdateTestCase(
       {String before,
       String after,
       String update})
       : this.expectedUpdate = update,
         super(before: before, after: after, canReuse: true);
 
   Future run() => loadMainApp().then((LibraryElement library) {
     // Capture the current version of [before] before invoking the [updater].
     PartialFunctionElement before = library.localLookup(expectedUpdate);
     var beforeNode = before.parseNode(compiler);
 
     var context = new IncrementalCompilerContext();
     LibraryUpdater updater =
         new LibraryUpdater(this.compiler, null, nolog, nolog, context);
     context.registerUriWithUpdates([scriptUri]);
 
     bool actualCanReuse =
-        updater.canReuseLibrary(library, UTF8.encode(newSource));
+        updater.canReuseLibrary(
+            library, <Script>[newScriptFrom(library, newSource)]);
     Expect.equals(expectedCanReuse, actualCanReuse);
 
     Update update = updater.updates.single;
 
     // Check that the [updater] didn't modify the changed element.
     Expect.identical(before, update.before);
     Expect.identical(beforeNode, before.parseNode(compiler));
 
     PartialFunctionElement after = update.after;
     var afterNode = after.parseNode(compiler);
@@ skipping 35 matching lines @@
 
           new ApplyUpdateTestCase(
               before: 'main(){}',
               after: 'main()=>null;',
               update: 'main'),
 
           // TODO(ahe): When supporting class members, test abstract methods.
       ]
   );
 }