Make Chrome splash screen same color as web UI's background color (#5169)

spec/controllers/manifests_controller_spec.rb

@@ -8,10 +8,6 @@ describe ManifestsController do
       get :show, format: :json
     end
 
-    it 'assigns @instance_presenter' do
-      expect(assigns(:instance_presenter)).to be_kind_of InstancePresenter
-    end
-
     it 'returns http success' do
       expect(response).to have_http_status(:success)
     end