Use library name instead of filename.

dart/tests/try/poi/serialize_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 that poi.dart can serialize a scope.
 
 library trydart.serialize_test;
 
 import 'dart:io' show
     Platform;
@@ skipping 13 matching lines @@
 import 'package:compiler/implementation/elements/elements.dart' show
     Element;
 
 import 'package:compiler/implementation/source_file_provider.dart' show
     FormattingDiagnosticHandler;
 
 Future testPoi() {
   Uri script = Platform.script.resolve('data/interesting.dart');
   FormattingDiagnosticHandler handler = new FormattingDiagnosticHandler();
 
-  int position = 241;
+  int position = 263;
+
   Future future = poi.runPoi(script, position, handler.provider, handler);
   return future.then((Element element) {
     Uri foundScript = element.compilationUnit.script.resourceUri;
     Expect.stringEquals('$script', '$foundScript');
     Expect.stringEquals('fisk', element.name);
 
     Expect.stringEquals(
         JSON.encode(expected),
         JSON.encode(JSON.decode(poi.scopeInformation(element, position))));
   });
@@ skipping 17 matching lines @@
       {
         "name": "hest",
         "kind": "function"
       },
       {
         "name": "",
         "kind": "generative_constructor"
       }
     ],
     "enclosing": {
-      "name": "tests/try/poi/data/interesting.dart",
+      "name": "interesting",
       "kind": "library",
       "members": [
         {
           "name": "main",
           "kind": "function"
         },
         {
           "name": "Foo",
           "kind": "class"
         }
       ]
     }
   }
 };