Dart: Removes all but native calls and the handle watcher from the snapshot.

services/dart/snapshot.dart

Index: services/dart/snapshot.dart
diff --git a/services/dart/snapshot.dart b/services/dart/snapshot.dart
index 27f9fbea17183004c3206c64c2871577842cc033..0c26603a88d0b5248c8ab13a88df522654cfa040 100644
--- a/services/dart/snapshot.dart
+++ b/services/dart/snapshot.dart
@@ -9,8 +9,6 @@ import 'dart:convert';
 import 'dart:isolate';
 import 'dart:math';
 import 'dart:mirrors';
-import 'dart:typed_data';
-import 'dart:mojo.application';
-import 'dart:mojo.bindings';
 import 'dart:mojo.builtin';
-import 'dart:mojo.core';
+import 'dart:mojo.internal';
+import 'dart:typed_data';