feat(BrowserSupport): remove PluginRequiredBrowser

WebRTC plugin support has been axed, this is now dead code.

react/features/unsupported-browser/components/PluginRequiredBrowser.js

@@ -1,47 +0,0 @@
-/*  @flow */
-
-import React, { Component } from 'react';
-
-import { CHROME, CHROMIUM, FIREFOX } from './browserLinks';
-
-/**
- * React component representing plugin installation required page.
- *
- * @class PluginRequiredBrowser
- */
-export default class PluginRequiredBrowser extends Component<*> {
-
-    /**
-     * Renders the component.
-     *
-     * @returns {ReactElement}
-     */
-    render() {
-        const ns = 'unsupported-desktop-browser';
-        const nsLink = `${ns}__link`;
-
-        return (
-            <div className = { ns }>
-                <h2 className = { `${ns}__title` }>
-                    Your browser requires a plugin for this conversation.
-                </h2>
-                <p className = { `${ns}__description_small` }>
-                    Once you install the plugin, it will be possible for you to
-                    have your conversation here. For the best experience,
-                    however, we strongly recommend that you do that using
-                    the&nbsp;
-                    <a
-                        className = { nsLink }
-                        href = { CHROME }>Chrome</a>,&nbsp;
-                    <a
-                        className = { nsLink }
-                        href = { CHROMIUM }>Chromium</a> or&nbsp;
-                    <a
-                        className = { nsLink }
-                        href = { FIREFOX }>Firefox</a> browsers.
-                </p>
-            </div>
-        );
-    }
-}
-

react/features/unsupported-browser/components/index.js

@@ -1,3 +1,2 @@
-export { default as PluginRequiredBrowser } from './PluginRequiredBrowser';
 export { default as UnsupportedDesktopBrowser }
     from './UnsupportedDesktopBrowser';