Remove unsupported `network_traffic` in specs

spec/features/snippets/notes_on_personal_snippets_spec.rb

@@ -74,18 +74,15 @@ describe 'Comments on personal snippets', :js do
 
     it 'should not have autocomplete' do
       wait_for_requests
-      request_count_before = page.driver.network_traffic.count
 
       find('#note_note').native.send_keys('')
       fill_in 'note[note]', with: '@'
 
       wait_for_requests
-      request_count_after = page.driver.network_traffic.count
 
       # This selector probably won't be in place even if autocomplete was enabled
       # but we want to make sure
       expect(page).not_to have_selector('.atwho-view')
-      expect(request_count_before).to eq(request_count_after)
     end
   end