Fix hidden try tests.

tests/try/poi/diff_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 element diff.
 library trydart.diff_test;
 
 import 'dart:async' show
     Future;
 
@@ skipping 61 matching lines @@
 
 Future<List<Difference>> testDifference(
     String beforeSource,
     String afterSource) {
   Uri scriptUri = customUri('main.dart');
   MockCompiler compiler = compilerFor(beforeSource, scriptUri);
 
   Future<LibraryElement> future = compiler.libraryLoader.loadLibrary(scriptUri);
   return future.then((LibraryElement library) {
     Script sourceScript = new Script(
-        scriptUri, scriptUri, new StringSourceFile('$scriptUri', afterSource));
+        scriptUri, scriptUri,
+        new StringSourceFile.fromUri(scriptUri, afterSource));
     var dartPrivacyIsBroken = compiler.libraryLoader;
     LibraryElement newLibrary = dartPrivacyIsBroken.createLibrarySync(
         null, sourceScript, scriptUri);
     return computeDifference(library, newLibrary);
   });
 }
 
 Future testData(Map data) {
   String beforeSource = data['beforeSource'];
   String afterSource = data['afterSource'];
@@ skipping 21 matching lines @@
         expectedBeforeName, elementNameOrNull(difference.before));
     Expect.stringEquals(expectedAfterName, elementNameOrNull(difference.after));
     print(difference);
   }
   Expect.isFalse(iterator.moveNext());
 }
 
 void main() {
   asyncTest(() => Future.forEach(TEST_DATA, testData));
 }