Merge branch '3.3' into 3.4

* 3.3:
  [DI] Fix dumping with custom base class
  [HttpFoundation] Add test
  [HttpFoundation] Fix session-related BC break
  [Process] Workaround PHP bug #75515 in ProcessTest::testSimpleInputStream()
  fix method name

Form.php

@@ -49,7 +49,7 @@
  * either as "Y-m-d" string or as timestamp. Internally we still want to
  * use a DateTime object for processing. To convert the data from string/integer
  * to DateTime you can set a normalization transformer by calling
- * addNormTransformer(). The normalized data is then converted to the displayed
+ * addModelTransformer(). The normalized data is then converted to the displayed
  * data as described before.
  *
  * The conversions (1) -> (2) -> (3) use the transform methods of the transformers.