More code clean-up

pkg/analyzer/lib/src/generated/java_io.dart

 library java.io;
 
 import "dart:io";
-import 'java_core.dart' show JavaIOException, CharSequence;
+import 'java_core.dart' show JavaIOException;
 import 'package:path/path.dart' as pathos;
 
 class JavaSystemIO {
   static Map<String, String> _properties = new Map();
   static String getProperty(String name) {
     {
       String value = _properties[name];
       if (value != null) {
         return value;
       }
@@ skipping 115 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);
 }