Remove $reponse param of Dispatcher::_invoke().

Use controller's $response property by default.

lib/Cake/Routing/Dispatcher.php

@@ -162,7 +162,7 @@ public function dispatch(CakeRequest $request, CakeResponse $response, $addition
 			));
 		}
 
-		$response = $this->_invoke($controller, $request, $response);
+		$response = $this->_invoke($controller, $request);
 		if (isset($request->params['return'])) {
 			return $response->body();
 		}
@@ -174,18 +174,19 @@ public function dispatch(CakeRequest $request, CakeResponse $response, $addition
 
 /**
  * Initializes the components and models a controller will be using.
- * Triggers the controller action, and invokes the rendering if Controller::$autoRender is true and echo's the output.
- * Otherwise the return value of the controller action are returned.
+ * Triggers the controller action, and invokes the rendering if Controller::$autoRender
+ * is true and echo's the output. Otherwise the return value of the controller
+ * action are returned.
  *
  * @param Controller $controller Controller to invoke
  * @param CakeRequest $request The request object to invoke the controller for.
- * @param CakeResponse $response The response object to receive the output
  * @return CakeResponse the resulting response object
  */
-	protected function _invoke(Controller $controller, CakeRequest $request, CakeResponse $response) {
+	protected function _invoke(Controller $controller, CakeRequest $request) {
 		$controller->constructClasses();
 		$controller->startupProcess();
 
+		$response = $controller->response;
 		$render = true;
 		$result = $controller->invokeAction($request);
 		if ($result instanceof CakeResponse) {

lib/Cake/Test/Case/Routing/DispatcherTest.php

@@ -57,12 +57,11 @@ class TestDispatcher extends Dispatcher {
  *
  * @param Controller $controller
  * @param CakeRequest $request
- * @param CakeResponse $response
- * @return void
+ * @return CakeResponse
  */
-	protected function _invoke(Controller $controller, CakeRequest $request, CakeResponse $response) {
+	protected function _invoke(Controller $controller, CakeRequest $request) {
 		$this->controller = $controller;
-		return parent::_invoke($controller, $request, $response);
+		return parent::_invoke($controller, $request);
 	}
 
 /**
@@ -508,7 +507,7 @@ class TestFilterDispatcher extends DispatcherFilter {
 
 /**
  * TestFilterDispatcher::beforeDispatch()
- * 
+ *
  * @param mixed $event
  * @return CakeResponse|boolean
  */
@@ -521,7 +520,7 @@ public function beforeDispatch(CakeEvent $event) {
 
 /**
  * TestFilterDispatcher::afterDispatch()
- * 
+ *
  * @param mixed $event
  * @return mixed boolean to stop the event dispatching or null to continue
  */