Bug 1752683 - Make nsILocalFileWin.canonicalPath [noscript]. r=xpcom-reviewers,mccr8

No JS callers use this attribute anymore.

Differential Revision: https://phabricator.services.mozilla.com/D137380

xpcom/io/nsILocalFileWin.idl

@@ -45,7 +45,7 @@ interface nsILocalFileWin : nsIFile
      * it will typically be the short pathname on filesystems that
      * support both short and long path forms.
      */
-    readonly attribute AString canonicalPath;
+    [noscript] readonly attribute AString canonicalPath;
     [noscript] readonly attribute ACString nativeCanonicalPath;
 
     /**