Merge branch '3.4'

* 3.4:
  [Bridge\Doctrine][FrameworkBundle] Deprecate some remaining uses of ContainerAwareTrait
  [FrameworkBundle] Fix bad interface hint in AbstractController
  [VarDumper] deprecate MongoCaster
  [HttpFoundation] deprecate using  with the legacy mongo extension; use it with the mongodb/mongodb package and ext-mongodb instead
  Fix BC layer
  Reset profiler.
  [DI] Improve some deprecation messages
  [DI] remove inheritdoc from dumped container
  [Config] Fix dumped files invalidation by OPCache
  [Security] Add Guard authenticator <supports> method
  [Cache] Fix race condition in TagAwareAdapter
  [DI] Allow setting any public non-initialized services
  [Yaml] parse references on merge keys
  treat trailing backslashes in multi-line strings
  [FrameworkBundle] Expose dotenv in bin/console about
  fix refreshing line numbers for the inline parser
  fix version in changelog
  [FrameworkBundle] Make Controller helpers final
  [DoctrineBridge] Deprecate DbalSessionHandler

Author: nicolas-grekas

DataCollector/TranslationDataCollector.php

@@ -58,6 +58,14 @@ public function collect(Request $request, Response $response, \Exception $except
     {
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function reset()
+    {
+        $this->data = array();
+    }
+
     /**
      * @return array
      */