Revert D8932114: [sonar] Add state tracking plumbing

Differential Revision:
D8932114

Original commit changeset: fb03babfe92b

fbshipit-source-id: a6a372a4115d69b5419a8c9924b333e7c163497b

xplat/Sonar/SonarStateUpdateListener.h

@@ -1,14 +0,0 @@
-/*
- *  Copyright (c) 2018-present, Facebook, Inc.
- *
- *  This source code is licensed under the MIT license found in the LICENSE
- *  file in the root directory of this source tree.
- *
- */
-
-#pragma once
-
-class SonarStateUpdateListener {
- public:
-  virtual void onUpdate() = 0;
-};