fix(ngMockE2E): pass responseType to $delegate when using passThrough

The `ngMockE2E` `$httpBackend` has a mechanism to allow requests to pass through, if one wants to
send a real HTTP request instead of mocking. The specified `responseType` of the request was never
passed through to the "real" `$httpBackend` (of the `ng` module), resulting in it being effectively
ignored.

Fixes #5415

Closes #5783

Author: biohazardpb4

src/ngMock/angular-mocks.js

@@ -1241,7 +1241,8 @@ function createHttpBackendMock($rootScope, $timeout, $delegate, $browser) {
   }
 
   // TODO(vojta): change params to: method, url, data, headers, callback
-  function $httpBackend(method, url, data, callback, headers, timeout, withCredentials) {
+  function $httpBackend(method, url, data, callback, headers, timeout, withCredentials, responseType) {
+
     var xhr = new MockXhr(),
         expectation = expectations[0],
         wasExpected = false;
@@ -1305,7 +1306,7 @@ function createHttpBackendMock($rootScope, $timeout, $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, withCredentials);
+          $delegate(method, url, data, callback, headers, timeout, withCredentials, responseType);
         } else throw new Error('No response defined !');
         return;
       }

test/ngMock/angular-mocksSpec.js

@@ -1794,10 +1794,10 @@ 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, {}, null, true);
+        hb('GET', '/passThrough/23', null, callback, {}, null, true, 'blob');
 
         expect(realHttpBackend).toHaveBeenCalledOnceWith(
-            'GET', '/passThrough/23', null, callback, {}, null, true);
+            'GET', '/passThrough/23', null, callback, {}, null, true, 'blob');
       });
 
       it('should be able to override a respond definition with passThrough', function() {
@@ -1806,7 +1806,7 @@ describe('ngMockE2E', function() {
         hb('GET', '/passThrough/23', null, callback, {}, null, true);
 
         expect(realHttpBackend).toHaveBeenCalledOnceWith(
-            'GET', '/passThrough/23', null, callback, {}, null, true);
+            'GET', '/passThrough/23', null, callback, {}, null, true, undefined);
       });
 
       it('should be able to override a respond definition with passThrough', inject(function($browser) {