perf(platform-browser): don’t use DomAdapter any more

But use the DOM apis directly.
This also creates a separate `ServerRenderer` implementation
for `platform-server` as it previously reused the `BrowserRenderer`.

modules/@angular/platform-webworker/test/web_workers/worker/renderer_integration_spec.ts

@@ -57,6 +57,9 @@ export function main() {
   }
 
   describe('Web Worker Renderer', () => {
+    // Don't run on server...
+    if (!getDOM().supportsDOMEvents()) return;
+
     var uiInjector: Injector;
     var uiRenderStore: RenderStore;
     var workerRenderStore: RenderStore;