Rebase websocket/long-invalid-header.html

The long-invalid-header.html test doesn't really test anything
interesting in the new implementation. It is just another case of
"garbage in the response headers". In this case there are none of the
required response headers, so the new implementation reports "Missing
Upgrade header". Rebase.

BUG=339373

Review URL: https://codereview.chromium.org/181183003

git-svn-id: svn://svn.chromium.org/blink/trunk@168009 bbb929c8-8fbe-4397-9dbb-9b2b20218538