Remove redundant 'has system focus' variable from 'get the client window info' algorithm.

Author: lutien

index.bs

@@ -2247,8 +2247,6 @@ To <dfn>get the client window info</dfn> given |client window|:
 
 1. Let |state| be [=get the client window state=] with |client window|.
 
-1. Let |has system focus| be false.
-
 1. If |client window| can receive keyboard input channeled from the operating
    system, let |active| be true, otherwise let |active| be false.
 
@@ -2263,8 +2261,8 @@ To <dfn>get the client window info</dfn> given |client window|:
    [=client window/x-coordinate=], the <code>y</code> field set to |client
    window|'s [=client window/y-coordinate=], the <code>width</code> field set to
    |client window|'s [=client window/width=], the <code>height</code> field
-   set to |client window|'s [=client window/height=], and the
-   <code>active</code> field set to |has system focus|.
+   set to |client window|'s [=client window/height=], and the <code>active</code>
+   field set to |active|.
 
 1. Return |client window info|