Start to remove now dead classes.

* Model & ClassRegistry have been replaced by the new ORM.
* Old non-functioning behaviors have been removed. We can forward port
  behaviors as people have time to fix them.
* DbAcl & the AclShell rely on the old Model class - which has been removed.
* Scaffold relies on the old Model and needs to be rethought.
* Parts of bake have been neutered, they relied on Model which is now
  gone.

Cake/Console/Command/Task/TestTask.php

@@ -21,7 +21,7 @@
 use Cake\Core\Configure;
 use Cake\Core\Plugin;
 use Cake\Error;
-use Cake\Utility\ClassRegistry;
+use Cake\ORM\TableRegistry;
 use Cake\Utility\Inflector;
 
 /**
@@ -287,10 +287,10 @@ public function isLoadableClass($package, $class) {
  * @return object And instance of the class that is going to be tested.
  */
 	public function buildTestSubject($type, $class) {
-		ClassRegistry::flush();
+		TableRegistry::clear();
 		$class = $this->getRealClassName($type, $class);
 		if (strtolower($type) === 'model') {
-			$instance = ClassRegistry::init($class);
+			$instance = TableRegistry::get($class);
 		} else {
 			$instance = new $class();
 		}

Cake/Controller/Controller.php

@@ -27,7 +27,6 @@
 use Cake\ORM\TableRegistry;
 use Cake\Routing\RequestActionTrait;
 use Cake\Routing\Router;
-use Cake\Utility\ClassRegistry;
 use Cake\Utility\Inflector;
 use Cake\Utility\MergeVariablesTrait;
 use Cake\Utility\RepositoryAwareTrait;
@@ -657,16 +656,6 @@ public function render($view = null, $layout = null) {
 
 		$this->View = $this->_getViewObject();
 
-		$models = ClassRegistry::keys();
-		foreach ($models as $currentModel) {
-			$currentObject = ClassRegistry::getObject($currentModel);
-			if ($currentObject instanceof \Cake\Model\Model) {
-				$className = get_class($currentObject);
-				$this->request->params['models'][$currentObject->alias] = compact('className');
-				$this->View->validationErrors[$currentObject->alias] =& $currentObject->validationErrors;
-			}
-		}
-
 		$this->autoRender = false;
 		$this->response->body($this->View->render($view, $layout));
 		return $this->response;