Revert "feature #45092 [HttpFoundation] Send Content-Length when calling Response::send() and the content is a non-empty string (nicolas-grekas)"

This reverts commit aff969d9353616bdbefbe64f5964f1f38d9e9260, reversing
changes made to 8b680f053208219e479ed7a8e82314b91f24f270.

Author: nicolas-grekas

CHANGELOG.md

@@ -6,7 +6,6 @@ CHANGELOG
 
  * Add stale while revalidate and stale if error cache header
  * Allow dynamic session "ttl" when using a remote storage
- * Send `Content-Length` when calling `Response::send()` and the content is a non-empty string
 
 6.0
 ---

Response.php

@@ -371,10 +371,6 @@ public function sendContent(): static
      */
     public function send(): static
     {
-        if (\is_string($this->content) && '' !== $this->content && !$this->headers->has('Transfer-Encoding')) {
-            $this->headers->set('Content-Length', \strlen($this->content));
-        }
-
         $this->sendHeaders();
         $this->sendContent();
 

Tests/ResponseTest.php

@@ -57,20 +57,6 @@ public function testSend()
         $this->assertObjectHasAttribute('statusCode', $responseSent);
         $this->assertObjectHasAttribute('statusText', $responseSent);
         $this->assertObjectHasAttribute('charset', $responseSent);
-        $this->assertFalse($responseSent->headers->has('Content-Length'));
-
-        ob_start();
-
-        $response = new Response('foo');
-        $responseSent = $response->send();
-        $this->assertSame('3', $responseSent->headers->get('Content-Length'));
-
-        $response = new Response('bar');
-        $response->headers->set('Transfer-Encoding', 'chunked');
-        $responseSent = $response->send();
-        $this->assertFalse($responseSent->headers->has('Content-Length'));
-
-        $this->assertSame('foobar', ob_get_clean());
     }
 
     public function testGetCharset()