Revert "minor #12652 [HttpFoundation] [Hackday] #9942 test: Request::getContent() for null value (skler)"

This reverts commit 09225c7466, reversing
changes made to a0298331ad.

src/Symfony/Component/HttpFoundation/Tests/RequestTest.php

@@ -921,13 +921,6 @@ class RequestTest extends \PHPUnit_Framework_TestCase
         $this->assertTrue(feof($retval));
     }
 
-    public function testEmptyStringContentReturns()
-    {
-        $req = Request::create('test');
-
-        $this->assertEquals('', $req->getContent());
-    }
-
     /**
      * @expectedException \LogicException
      * @dataProvider getContentCantBeCalledTwiceWithResourcesProvider