Migrate over 4.4 lib dom and webworker (#45324)

* Brings across 4.4 DOM + Web Worker changes

* Adds tests

* Incorporate #1092 and #1093 from TypeScript-DOM-lib-generator

* update baselines

Co-authored-by: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>

Author: Orta Therox

src/lib/dom.generated.d.ts

@@ -89,7 +89,7 @@ interface HTMLFormElement {
 }
 
 interface HTMLSelectElement {
-    [Symbol.iterator](): IterableIterator<Element>;
+    [Symbol.iterator](): IterableIterator<HTMLOptionElement>;
 }
 
 interface Headers {
@@ -141,7 +141,7 @@ interface MessageEvent<T = any> {
 }
 
 interface MimeTypeArray {
-    [Symbol.iterator](): IterableIterator<any>;
+    [Symbol.iterator](): IterableIterator<MimeType>;
 }
 
 interface NamedNodeMap {
@@ -186,11 +186,11 @@ interface NodeListOf<TNode extends Node> {
 }
 
 interface Plugin {
-    [Symbol.iterator](): IterableIterator<undefined>;
+    [Symbol.iterator](): IterableIterator<MimeType>;
 }
 
 interface PluginArray {
-    [Symbol.iterator](): IterableIterator<any>;
+    [Symbol.iterator](): IterableIterator<Plugin>;
 }
 
 interface RTCStatsReport extends ReadonlyMap<string, any> {