Revert "Added ability to request zone memory information for all isolates through the VM service an…

runtime/observatory/lib/src/models/objects/zone.dart

Index: runtime/observatory/lib/src/models/objects/zone.dart
diff --git a/runtime/observatory/lib/src/models/objects/zone.dart b/runtime/observatory/lib/src/models/objects/zone.dart
deleted file mode 100644
index 51840cbcafd34ee16ef97ff0dee8ea555c08539f..0000000000000000000000000000000000000000
--- a/runtime/observatory/lib/src/models/objects/zone.dart
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright (c) 2016, 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.
-
-part of models;
-
-abstract class Zone {
-  /// The total amount of memory in bytes allocated in the zone, including
-  /// memory that is not actually being used.
-  int get capacity;
-
-  /// The total amount of memory in bytes actually used in the zone.
-  int get used;
-}