Overrides \Drupal\Component\Plugin\PluginManagerBase::__construct().
\Traversable $namespaces: An object that implements \Traversable which contains the root paths keyed by the corresponding namespace to look for plugin implementations,
public function __construct(\Traversable $namespaces) {
$annotation_namespaces = array(
'Drupal\\ckeditor\\Annotation' => $namespaces['Drupal\\ckeditor'],
);
$this->discovery = new AnnotatedClassDiscovery('CKEditorPlugin', $namespaces, $annotation_namespaces, 'Drupal\\ckeditor\\Annotation\\CKEditorPlugin');
$this->discovery = new AlterDecorator($this->discovery, 'ckeditor_plugin_info');
$this->discovery = new CacheDecorator($this->discovery, 'ckeditor_plugin');
$this->factory = new DefaultFactory($this->discovery);
}