Fix sfWebResponse->getContentType() return a string not an array

Author: Tybaze

lib/response/sfWebResponse.class.php

@@ -312,7 +312,7 @@ public function getCharset()
   /**
    * Gets response content type.
    *
-   * @return array
+   * @return string
    */
   public function getContentType()
   {

test/unit/response/sfWebResponseTest.php

@@ -132,7 +132,7 @@ public function normalizeHeaderName($name)
 
 $response->setContentType('text/xml');
 $response->setContentType('text/html');
-$t->is(count($response->getHttpHeader('content-type')), 1, '->setContentType() overrides previous content type if replace is true');
+$t->is($response->getHttpHeader('content-type'), 'text/html; charset=ISO-8859-1', '->setContentType() overrides previous content type if replace is true');
 
 // ->getTitle() ->setTitle() ->prependTitle
 $t->diag('->getTitle() ->setTitle() ->prependTitle()');