refactor($http) Simplify code by removing the createXhr() method

This removes a workaround for IE 8 and and error handling for IE6.

Author: realityking

src/ng/httpBackend.js

@@ -1,19 +1,5 @@
 'use strict';
 
-function createXhr(method) {
-    //if IE and the method is not RFC2616 compliant, or if XMLHttpRequest
-    //is not available, try getting an ActiveXObject. Otherwise, use XMLHttpRequest
-    //if it is available
-    if (msie <= 8 && (!method.match(/^(get|post|head|put|delete|options)$/i) ||
-      !window.XMLHttpRequest)) {
-      return new window.ActiveXObject("Microsoft.XMLHTTP");
-    } else if (window.XMLHttpRequest) {
-      return new window.XMLHttpRequest();
-    }
-
-    throw minErr('$httpBackend')('noxhr', "This browser does not support XMLHttpRequest.");
-}
-
 /**
  * @ngdoc service
  * @name $httpBackend
@@ -32,11 +18,11 @@ function createXhr(method) {
  */
 function $HttpBackendProvider() {
   this.$get = ['$browser', '$window', '$document', function($browser, $window, $document) {
-    return createHttpBackend($browser, createXhr, $browser.defer, $window.angular.callbacks, $document[0]);
+    return createHttpBackend($browser, $browser.defer, $window.angular.callbacks, $document[0]);
   }];
 }
 
-function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDocument) {
+function createHttpBackend($browser, $browserDefer, callbacks, rawDocument) {
   var ABORTED = -1;
 
   // TODO(vojta): fix the signature
@@ -59,7 +45,7 @@ function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDoc
       });
     } else {
 
-      var xhr = createXhr(method);
+      var xhr = new window.XMLHttpRequest();
 
       xhr.open(method, url, true);
       forEach(headers, function(value, key) {