fix contexts throughout emulations

Author: sadym-chromium

index.bs

@@ -6374,7 +6374,7 @@ The [=remote end steps=] given |session| and |command parameters| are:
 
    1. Set |emulated user agent| to |command parameters|["<code>userAgent</code>"].
 
-1. If |command parameters| [=map/contains=] "<code>context</code>":
+1. If |command parameters| [=map/contains=] "<code>contexts</code>":
 
    1. Let |navigables| be the result of [=trying=] to
       [=get valid top-level traversables by ids=] with
@@ -6477,11 +6477,11 @@ The <dfn export>WebDriver BiDi scripting is enabled</dfn> steps given
 The [=remote end steps=] with |command parameters| are:
 
 1. If |command parameters| [=map/contains=] "<code>userContexts</code>"
-   and |command parameters| [=map/contains=] "<code>context</code>",
+   and |command parameters| [=map/contains=] "<code>contexts</code>",
    return [=error=] with [=error code=] [=invalid argument=].
 
 1. If |command parameters| doesn't [=map/contain=] "<code>userContexts</code>"
-   and |command parameters| doesn't [=map/contain=] "<code>context</code>",
+   and |command parameters| doesn't [=map/contain=] "<code>contexts</code>",
    return [=error=] with [=error code=] [=invalid argument=].
 
 1. Let |emulated scripting enabled status| be null.
@@ -6586,11 +6586,11 @@ steps:
 The [=remote end steps=] with |command parameters| are:
 
 1. If |command parameters| [=map/contains=] "<code>userContexts</code>"
-   and |command parameters| [=map/contains=] "<code>context</code>",
+   and |command parameters| [=map/contains=] "<code>contexts</code>",
    return [=error=] with [=error code=] [=invalid argument=].
 
 1. If |command parameters| doesn't [=map/contain=] "<code>userContexts</code>"
-   and |command parameters| doesn't [=map/contain=] "<code>context</code>",
+   and |command parameters| doesn't [=map/contain=] "<code>contexts</code>",
    return [=error=] with [=error code=] [=invalid argument=].
 
 1. Let |emulated timezone| be null.