Removed unneeded spec

spec/features/projects/blobs/balsamiq_preview_spec.rb

-require 'spec_helper'
-
-feature 'Balsamiq preview', :feature, :js do
-  include TreeHelper
-
-  let(:user) { create(:user) }
-  let(:project) { create(:project) }
-  let(:branch) { 'add-balsamiq-file' }
-  let(:path) { 'files/images/balsamiq.bmpr' }
-
-  before do
-    project.add_master(user)
-    login_as user
-    visit namespace_project_blob_path(project.namespace, project, tree_join(branch, path))
-  end
-
-  it 'should show a loading icon' do
-    expect(find('.file-content')).to have_selector('.loading')
-  end
-
-  it 'should show a viewer container' do
-    expect(page).to have_selector('.balsamiq-viewer')
-  end
-end