Remove IE8/9 support

javascript/lib/long_poll_transport.coffee

@@ -109,49 +109,4 @@ class LongPollTransport extends Transport
       # Reconnect with delay
       setTimeout @_request, @_retryDelay
 
-# Let's try to hack in support for IE8-9 via the XDomainRequest object!
-# This was adapted from code shamelessly stolen from:
-# https://github.com/jaubourg/ajaxHooks/blob/master/src/ajax/xdr.js
-if $?.browser?.msie and parseInt($.browser.version, 10) in [8, 9]
-  jQuery.ajaxTransport (s) ->
-    if s.crossDomain and s.async and s.firehose
-      if s.timeout
-        s.xdrTimeout = s.timeout
-        delete s.timeout
-      xdr = undefined
-      return {
-        send: (_, complete) ->
-          callback = (status, statusText, responses, responseHeaders) ->
-            xdr.onload = xdr.onerror = xdr.ontimeout = jQuery.noop
-            xdr = undefined
-            complete status, statusText, responses, responseHeaders
-
-          xdr = new XDomainRequest()
-
-          xdr.open s.type, s.url
-
-          xdr.onload = ->
-            headers = "Content-Type: #{xdr.contentType}"
-            callback 200, "OK", {text: xdr.responseText}, headers
-
-          xdr.onerror = -> callback 404, "Not Found"
-
-          # This is critical for long poll to work in IE9.
-          # Without it, the initial request will work but
-          # subsequent requests will fail silently.
-          # http://social.msdn.microsoft.com/Forums/ie/en-US/30ef3add-767c-4436-b8a9-f1ca19b4812e/ie9-rtm-xdomainrequest-issued-requests-may-abort-if-all-event-handlers-not-specified?forum=iewebdevelopment
-          xdr.onprogress = -> {}
-
-          if s.xdrTimeout?
-            xdr.ontimeout = -> callback 0, "timeout"
-            xdr.timeout   = s.xdrTimeout
-
-          xdr.send (s.hasContent and s.data) or null
-
-        abort: ->
-          if xdr?
-            xdr.onerror = jQuery.noop()
-            xdr.abort()
-      }
-
 module.exports = LongPollTransport