Use JavaFile instead of Dart File.

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

Index: editor/util/plugins/com.google.dart.java2dart/resources/java_engine_io.dart
diff --git a/editor/util/plugins/com.google.dart.java2dart/resources/java_engine_io.dart b/editor/util/plugins/com.google.dart.java2dart/resources/java_engine_io.dart
index 844df0f05a41e92a0a5ffcb02cdd7db36e69aeb9..32923b692b9b8a6d1576478365b3036a0acfb337 100644
--- a/editor/util/plugins/com.google.dart.java2dart/resources/java_engine_io.dart
+++ b/editor/util/plugins/com.google.dart.java2dart/resources/java_engine_io.dart
@@ -1,6 +1,7 @@
 library java.engine.io;
 
 import "dart:io";
+import "java_io.dart";
 
 
 class OSUtilities {
@@ -9,5 +10,5 @@ class OSUtilities {
 }
 
 class FileUtilities2 {
-  static File createFile(String path) => new File(path);
+  static JavaFile createFile(String path) => new JavaFile(path);
 }