[cssom-view] Remove checkAriaHidden option, per w3c#7232

Author: tabatkins

cssom-view-1/Overview.bs

@@ -1038,7 +1038,6 @@ dictionary ScrollIntoViewOptions : ScrollOptions {
 };
 
 dictionary IsVisibleOptions {
-    boolean checkAriaHidden = false;
     boolean checkInert = false;
     boolean checkOpacity = false;
     boolean checkVisibilityCSS = false;
@@ -1121,10 +1120,6 @@ Note: The {{DOMRect}} object returned by {{Element/getBoundingClientRect()}} is
     1. If a [=shadow-including ancestor=] of |this|
         has ''content-visibility: hidden'',
         return false.
-    1. If the {{IsVisibleOptions/checkAriaHidden}} dictionary member of |options|
-        is true,
-        and |this| is [=hidden=] (in the ARIA sense),
-        return false.
     1. If the {{IsVisibleOptions/checkInert}} dictionary member of |options|
         is true,
         and |this| is [=inert=],