Merge branch 'ee-dispatcher-branches-create' into 'master'

Refactor dispatcher project branches create path (EE)

See merge request gitlab-org/gitlab-ee!4012

app/assets/javascripts/dispatcher.js

@@ -6,7 +6,6 @@ import Milestone from './milestone';
 import IssuableForm from './issuable_form';
 import LabelsSelect from './labels_select';
 import MilestoneSelect from './milestone_select';
-import NewBranchForm from './new_branch_form';
 import NotificationsForm from './notifications_form';
 import notificationsDropdown from './notifications_dropdown';
 import groupAvatar from './group_avatar';
@@ -241,8 +240,14 @@ import initLDAPGroupsSelect from 'ee/ldap_groups_select'; // eslint-disable-line
           initChangesDropdown(document.querySelector('.navbar-gitlab').offsetHeight - paddingTop);
           break;
         case 'projects:branches:new':
+          import('./pages/projects/branches/new')
+            .then(callDefault)
+            .catch(fail);
+          break;
         case 'projects:branches:create':
-          new NewBranchForm($('.js-create-branch-form'), JSON.parse(document.getElementById('availableRefs').innerHTML));
+          import('./pages/projects/branches/new')
+            .then(callDefault)
+            .catch(fail);
           break;
         case 'projects:branches:index':
           import('./pages/projects/branches/index')

app/assets/javascripts/pages/projects/branches/new/index.js

+import NewBranchForm from '~/new_branch_form';
+
+export default () => new NewBranchForm($('.js-create-branch-form'), JSON.parse(document.getElementById('availableRefs').innerHTML));