Delete a profile field.
$field: The field to be deleted.
function deleteProfileField($field) {
$this
->drupalPost('admin/config/people/profile/delete/' . $field['fid'], array(), t('Delete'));
$this
->drupalGet('admin/config/people/profile');
$this
->assertNoText($field['title'], format_string('Checking deleted field %title', array(
'%title' => $field['title'],
)));
}