Fix for opening SDK sources.

editor/util/plugins/com.google.dart.java2dart/resources/java_io.dart

 library java.io;
 
 import "dart:io";
 import 'java_core.dart' show JavaIOException, CharSequence;
 import 'package:path/path.dart' as pathos;
 
 class JavaSystemIO {
   static Map<String, String> _properties = new Map();
   static String getProperty(String name) {
     {
@@ skipping 38 matching lines @@
     return oldValue;
   }
   static String getenv(String name) => Platform.environment[name];
 }
 
 class JavaFile {
   static final String separator = Platform.pathSeparator;
   static final int separatorChar = Platform.pathSeparator.codeUnitAt(0);
   String _path;
   JavaFile(String path) {
-    _path = pathos.absolute(path);
+    _path = path;
   }
   JavaFile.relative(JavaFile base, String child) {
     if (child.isEmpty) {
       this._path = base._path;
     } else {
       this._path = pathos.join(base._path, child);
     }
   }
   JavaFile.fromUri(Uri uri) : this(pathos.fromUri(uri));
   String toString() => _path.toString();
@@ skipping 53 matching lines @@
     var files = <JavaFile>[];
     var entities = _newDirectory().listSync();
     for (FileSystemEntity entity in entities) {
       files.add(new JavaFile(entity.path));
     }
     return files;
   }
   File _newFile() => new File(_path);
   Directory _newDirectory() => new Directory(_path);
 }