Remove invalid URI in an attempt to fix a windows bug.

pkg/analyzer/test/parse_compilation_unit_test.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.
 
 library analyzer.test.parse_compilation_unit_test;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:unittest/unittest.dart';
 
 import 'utils.dart';
 
 void main() {
   initializeTestEnvironment();
   test("parses a valid compilation unit successfully", () {
     var unit = parseCompilationUnit("void main() => print('Hello, world!');");
     expect(unit.toString(), equals("void main() => print('Hello, world!');"));
   });
 
   test("throws errors for an invalid compilation unit", () {
     expect(() {
       parseCompilationUnit("void main() => print('Hello, world!')",
           name: 'test.dart');
     }, throwsA(predicate((error) {
       return error is AnalyzerErrorGroup &&
           error.toString().contains("Error in test.dart: Expected to find ';'");
     })));
   });
 
-  test("defaults to '<unknown source>' if no name is provided", () {
+  test("defaults to 'null' if no name is provided", () {
     expect(() {
       parseCompilationUnit("void main() => print('Hello, world!')");
     }, throwsA(predicate((error) {
       return error is AnalyzerErrorGroup &&
-          error
-              .toString()
-              .contains("Error in <unknown source>: Expected to find ';'");
+          error.toString().contains("Error in null: Expected to find ';'");

[Paul Berry, 2016/03/01 17:14:32]

It seems like a shame to expose the user to the phrase "Error in null".

How about if we change AnalyzerError.toString() so that if
`error.source.shortName` is null, it defaults to '<unknown source>'?  That way
we would still avoid the Windows bug but user-visible behavior wouldn't be
degraded.

[Brian Wilkerson, 2016/03/02 16:31:00]

You're right, that is better. Done.

     })));
   });
 
   test("allows you to specify whether or not to parse function bodies", () {
     var unit = parseCompilationUnit("void main() => print('Hello, world!');",
         parseFunctionBodies: false);
     expect(unit.toString(), equals("void main();"));
   });
 }