fix(ngMock): keep withCredentials on passThrough

When using passThrough() and specifying withCredentials on the $http
call, the option is now passed to the underlying $httpBackend.

src/ngMock/angular-mocks.js

@@ -1045,7 +1045,7 @@ function createHttpBackendMock($rootScope, $delegate, $browser) {
   }
 
   // TODO(vojta): change params to: method, url, data, headers, callback
-  function $httpBackend(method, url, data, callback, headers, timeout) {
+  function $httpBackend(method, url, data, callback, headers, timeout, withCredentials) {
     var xhr = new MockXhr(),
         expectation = expectations[0],
         wasExpected = false;
@@ -1103,7 +1103,7 @@ function createHttpBackendMock($rootScope, $delegate, $browser) {
           // if $browser specified, we do auto flush all requests
           ($browser ? $browser.defer : responsesPush)(wrapResponse(definition));
         } else if (definition.passThrough) {
-          $delegate(method, url, data, callback, headers, timeout);
+          $delegate(method, url, data, callback, headers, timeout, withCredentials);
         } else throw Error('No response defined !');
         return;
       }

test/ngMock/angular-mocksSpec.js

@@ -1088,10 +1088,10 @@ describe('ngMockE2E', function() {
     describe('passThrough()', function() {
       it('should delegate requests to the real backend when passThrough is invoked', function() {
         hb.when('GET', /\/passThrough\/.*/).passThrough();
-        hb('GET', '/passThrough/23', null, callback);
+        hb('GET', '/passThrough/23', null, callback, {}, null, true);
 
         expect(realHttpBackend).toHaveBeenCalledOnceWith(
-            'GET', '/passThrough/23', null, callback, undefined, undefined);
+            'GET', '/passThrough/23', null, callback, {}, null, true);
       });
     });