- Fix usage of Platform.packageRoot.

tests/compiler/dart2js/analyze_helper.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 analyze_helper;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:compiler/compiler.dart' as api;
 import 'package:compiler/src/apiimpl.dart';
@@ skipping 136 matching lines @@
 
 ===
 === NOTE: If this test fails, update [WHITE_LIST] in $testFileName
 ===
 
 
 """);
 
   var libraryRoot = currentDirectory.resolve('sdk/');
   var packageRoot =
-      currentDirectory.resolveUri(new Uri.file('${Platform.packageRoot}/'));
+      currentDirectory.resolveUri(Uri.parse(Platform.packageRoot));
   var provider = new CompilerSourceFileProvider();
   var handler = new CollectingDiagnosticHandler(whiteList, provider);
   var options = <String>[Flags.analyzeOnly, '--categories=Client,Server',
       Flags.showPackageWarnings];
   if (analyzeAll) options.add(Flags.analyzeAll);
   if (analyzeMain) options.add(Flags.analyzeMain);
   var compiler = new CompilerImpl(
       provider,
       null,
       handler,
@@ skipping 23 matching lines @@
       exit(1);
     }
   }
   if (analyzeAll || analyzeMain) {
     compiler.librariesToAnalyzeWhenRun = uriList;
     return compiler.run(null).then(onCompletion);
   } else {
     return compiler.run(uriList.single).then(onCompletion);
   }
 }