Revert to temporary AbortSignal fix (microsoft#47643)

I forgot to keep the temporary fix when I updated the DOM yesterday.

Author: sandersn

Diff for: src/lib/dom.generated.d.ts

@@ -1903,7 +1903,7 @@ interface AbortSignal extends EventTarget {
 declare var AbortSignal: {
     prototype: AbortSignal;
     new(): AbortSignal;
-    abort(reason?: any): AbortSignal;
+    // abort(): AbortSignal; - To be re-added in the future
 };
 
 interface AbstractRange {