Simplify take() internal observer

spec.bs

@@ -718,8 +718,6 @@ For now, see [https://github.com/wicg/observable#operators](https://github.com/w
        1. If |amount| is 0, then run |subscriber|'s {{Subscriber/complete()}} method and abort
           these steps.
 
-       1. Let |controller| be a [=new=] {{AbortController}}.
-
        1. Let |sourceObserver| be a new [=internal observer=], initialized as follows:
 
           : [=internal observer/next steps=]
@@ -728,11 +726,7 @@ For now, see [https://github.com/wicg/observable#operators](https://github.com/w
 
              1. Decrement |amount|.
 
-             1. If |amount| is 0, then:
-
-                1. Run |subscriber|'s {{Subscriber/complete()}} method.
-
-                1. [=AbortController/Signal abort=] |controller|.
+             1. If |amount| is 0, then run |subscriber|'s {{Subscriber/complete()}} method.
 
           : [=internal observer/error steps=]
           :: Run |subscriber|'s {{Subscriber/error()}} method, given the passed in <var
@@ -741,11 +735,8 @@ For now, see [https://github.com/wicg/observable#operators](https://github.com/w
           : [=internal observer/complete steps=]
           :: Run |subscriber|'s {{Subscriber/complete()}} method.
 
-       1. Let |signal| be the result of [=creating a dependent abort signal=] from the list
-          «|controller|'s [=AbortController/signal=], |subscriber|'s [=Subscriber/signal=]», using
-          {{AbortSignal}}, and the [=current realm=].
-
-       1. Let |options| be a new {{SubscribeOptions}} whose {{SubscribeOptions/signal}} is |signal|.
+       1. Let |options| be a new {{SubscribeOptions}} whose {{SubscribeOptions/signal}} is
+          |subscriber|'s [=Subscriber/signal=].
 
        1. <a for=Observable lt="subscribe to an Observable">Subscribe</a> to |sourceObservable|
           given |sourceObserver| and |options|.