Remove unused code

app/controllers/projects/notes_controller.rb

@@ -28,8 +28,7 @@ class Projects::NotesController < Projects::ApplicationController
   def create
     create_params = note_params.merge(
       merge_request_diff_head_sha: params[:merge_request_diff_head_sha],
-      in_reply_to_discussion_id: params[:in_reply_to_discussion_id],
-      new_discussion: params[:new_discussion],
+      in_reply_to_discussion_id: params[:in_reply_to_discussion_id]
     )
     @note = Notes::CreateService.new(project, current_user, create_params).execute
 

app/services/notes/build_service.rb

@@ -2,7 +2,6 @@ module Notes
   class BuildService < ::BaseService
     def execute
       in_reply_to_discussion_id = params.delete(:in_reply_to_discussion_id)
-      new_discussion = params.delete(:new_discussion)
 
       if project && in_reply_to_discussion_id.present?
         discussion = project.notes.find_discussion(in_reply_to_discussion_id)
@@ -14,9 +13,6 @@ module Notes
         end
 
         params.merge!(discussion.reply_attributes)
-      elsif new_discussion
-        # TODO: Remove when we use a selectbox instead of a submit button
-        params[:type] = DiscussionNote.name
       end
 
       note = Note.new(params)

spec/controllers/projects/notes_controller_spec.rb

@@ -153,8 +153,7 @@ describe Projects::NotesController do
           noteable_id: merge_request.id.to_s,
           noteable_type: 'MergeRequest',
           merge_request_diff_head_sha: 'sha',
-          in_reply_to_discussion_id: nil,
-          new_discussion: nil
+          in_reply_to_discussion_id: nil
         }
 
         expect(Notes::CreateService).to receive(:new).with(project, user, service_params).and_return(double(execute: true))