Merge branch '3.4' into 4.3

* 3.4: (21 commits)
  [SecurityBundle] fix return type declarations
  [BrowserKit] fix return type declarations
  [PropertyInfo] fix return type declarations
  [Bridge/Doctrine] fix return type declarations
  [Form] fix return type declarations
  [Console] fix return type declarations
  [Intl] fix return type declarations
  [Templating] fix return type declarations
  [DomCrawler] fix return type declarations
  [Validator] fix return type declarations
  [Process] fix return type declarations
  [Workflow] fix return type declarations
  [Cache] fix return type declarations
  [Serializer] fix return type declarations
  [Translation] fix return type declarations
  [DI] fix return type declarations
  [Config] fix return type declarations
  [HttpKernel] Fix return type declarations
  [Security] Fix return type declarations
  [Routing] Fix return type declarations
  ...

Author: nicolas-grekas

Router.php

@@ -277,9 +277,9 @@ public function matchRequest(Request $request)
     }
 
     /**
-     * Gets the UrlMatcher instance associated with this Router.
+     * Gets the UrlMatcher or RequestMatcher instance associated with this Router.
      *
-     * @return UrlMatcherInterface A UrlMatcherInterface instance
+     * @return UrlMatcherInterface|RequestMatcherInterface
      */
     public function getMatcher()
     {