Back out "JS apps support 1/n"

Summary:
Original commit changeset: 56d1ca1a60ed

This broke Android support in some instances. We haven't had a chance to investigate this yet, but this should cleanly reapply, so we can figure out what happened after the release.

Reviewed By: cekkaewnumchai

Differential Revision: D18688590

fbshipit-source-id: ff84080d43fa481cc8c8c669a76aed15d0f8aa56

src/devices/JSDevice.tsx

@@ -1,20 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @format
- */
-
-import BaseDevice from './BaseDevice';
-
-export default class JSDevice extends BaseDevice {
-  webContentsId: number;
-
-  constructor(serial: string, title: string, webContentsId: number) {
-    super(serial, 'emulator', title, 'JSWebApp');
-    this.devicePlugins = [];
-    this.webContentsId = webContentsId;
-  }
-}