fix: cleanup public api of platform-server

BREAKING CHANGE: Parse5Adapter is no longer exported as public API, use serverBootstrap()

Parse5Adapter is an implementation detail not a public API

Closes #9237

Closes #9205

modules/@angular/platform-server/test/integration_spec.ts

@@ -0,0 +1,34 @@
+import {Component, disposePlatform} from '@angular/core';
+import {afterEach, async, beforeEach, ddescribe, describe, expect, iit, inject, it, xdescribe, xit} from '@angular/core/testing';
+import {BROWSER_APP_PROVIDERS} from '@angular/platform-browser';
+import {BROWSER_APP_COMPILER_PROVIDERS} from '@angular/platform-browser-dynamic';
+import {getDOM} from '@angular/platform-browser/src/dom/dom_adapter';
+import {serverBootstrap} from '@angular/platform-server';
+
+function writeBody(html: string): any {
+  var dom = getDOM();
+  var doc = dom.defaultDoc();
+  var body = dom.querySelector(doc, 'body');
+  dom.setInnerHTML(body, html);
+  return body;
+}
+
+export function main() {
+  if (getDOM().supportsDOMEvents()) return;  // NODE only
+
+  describe('platform-server integration', () => {
+
+    afterEach(() => disposePlatform());
+
+    it('should bootstrap', async(() => {
+         var body = writeBody('<app></app>');
+         serverBootstrap(MyServerApp, [
+           BROWSER_APP_PROVIDERS, BROWSER_APP_COMPILER_PROVIDERS
+         ]).then(() => { expect(getDOM().getText(body)).toEqual('Works!'); });
+       }));
+  });
+}
+
+@Component({selector: 'app', template: `Works!`})
+class MyServerApp {
+}