Match XHR behavor at 2.5. The browser default content type is application/xml, so we set that as our default contentType option. Looks like there is no browser default for encoding, so we remove that. r=crschmidt (closes #1232)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5570 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Ajax.js

@@ -248,8 +248,7 @@ OpenLayers.Ajax.Base = OpenLayers.Class({
         this.options = {
             method:       'post',
             asynchronous: true,
-            contentType:  'application/x-www-form-urlencoded',
+            contentType:  'application/xml',
-            encoding:     'UTF-8',
             parameters:   ''
         };
         OpenLayers.Util.extend(this.options, options || {});