chrome driver for chrome 86 (flutter#21705)

Author: nturgut

lib/web_ui/dev/driver_version.yaml

@@ -1,6 +1,7 @@
 ## Map for driver versions to use for each browser version.
 ## See: https://chromedriver.chromium.org/downloads
 chrome:
+  86: '86.0.4240.22'
   85: '85.0.4183.38'
   84: '84.0.4147.30'
   83: '83.0.4103.39'

lib/web_ui/pubspec.yaml

@@ -34,4 +34,4 @@ dev_dependencies:
     git:
       url: git://github.com/flutter/web_installers.git
       path: packages/web_drivers/
-      ref: 1cea0d79cad1ebc217c4bcbeba1be41470674a49
+      ref: 58081a8b2fbf234e9c8da86fce28adfefe3c2093