Remove unused browsing context from navigable destroyed steps (#751)

Author: OrKoN

index.bs

@@ -4263,8 +4263,7 @@ The [=remote end event trigger=] is:
 <div algorithm="remote end event trigger for browsingContext.contexDestroyed">
 
 The [=remote end event trigger=] is
-the <dfn export>WebDriver BiDi navigable destroyed</dfn> steps given
-|navigable| and <var ignore>browsing context</var>:
+the <dfn export>WebDriver BiDi navigable destroyed</dfn> steps given |navigable|:
 
 1. Let |params| be the result of [=get the navigable info=], given
    |navigable|, null, and true.