Calling HttpWebResponse.Close in .NET bindings
Preventing crash in IE driver using synthetic events

In some cases document.activeElement returns an empty object rather than
null. This could cause the IE driver to crash. This change fixes the
crash, but not the underlying JavaScript atoms issue. This will be handled
by another issue. Fixes issue #6067.
Guarding around IE returning an empty object for the active element
Updating IE atoms header