merge request form uses new GLForm

app/assets/javascripts/dispatcher.js.coffee

@@ -40,7 +40,7 @@ class Dispatcher
       when 'projects:merge_requests:new', 'projects:merge_requests:edit'
         new Diff()
         shortcut_handler = new ShortcutsNavigation()
-        new DropzoneInput($('.merge-request-form'))
+        new GLForm($('.merge-request-form'))
         new IssuableForm($('.merge-request-form'))
       when 'projects:tags:new'
         new ZenMode()

app/views/projects/merge_requests/_form.html.haml

-= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], html: { class: 'merge-request-form form-horizontal gfm-form js-requires-input js-quick-submit' } do |f|
+= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], html: { class: 'merge-request-form form-horizontal common-note-form js-requires-input js-quick-submit' } do |f|
   = render 'shared/issuable/form', f: f, issuable: @merge_request
 
 :javascript

app/views/projects/merge_requests/_new_submit.html.haml

@@ -10,7 +10,7 @@
   %span.pull-right
     = link_to 'Change branches', mr_change_branches_path(@merge_request)
 %hr
-= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], html: { class: 'merge-request-form form-horizontal gfm-form js-requires-input' } do |f|
+= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], html: { class: 'merge-request-form form-horizontal common-note-form js-requires-input' } do |f|
   = render 'shared/issuable/form', f: f, issuable: @merge_request
   = f.hidden_field :source_project_id
   = f.hidden_field :source_branch