Remove unused parameter from $.cache

src/platform/$.coffee

@@ -84,20 +84,21 @@ $.ajax = do ->
 
 do ->
   reqs = {}
-  $.cache = (url, cb, options={}, extra={}) ->
+  $.cache = (url, cb, options={}) ->
+    {ajax} = options
     if (req = reqs[url])
       if req.callbacks
         req.callbacks.push cb
       else
         $.queueTask -> cb.call req, {isCached: true}
       return req
-    options.onloadend = ->
+    onloadend = ->
       unless @status
         delete reqs[url]
       for cb in @callbacks
         do (cb) => $.queueTask => cb.call @, {isCached: false}
       delete @callbacks
-    req = (extra.ajax or $.ajax) url, options
+    req = (ajax or $.ajax) url, {onloadend}
     req.callbacks = [cb]
     reqs[url] = req
   $.cleanCache = (testf) ->

src/platform/CrossOrigin.coffee

@@ -110,9 +110,9 @@ CrossOrigin =
 
     req
 
-  cache: (url, cb, options={}, extra={}) ->
-    extra.ajax = CrossOrigin.ajax
-    $.cache url, cb, options, extra
+  cache: (url, cb) ->
+    $.cache url, cb,
+      ajax: CrossOrigin.ajax
 
   permission: (cb) ->
     <% if (type === 'crx') { %>