bug #34533 [Monolog Bridge] Fixed accessing static property as non st…

…atic. (Sander-Toonen)

This PR was submitted for the 4.4 branch but it was merged into the 3.4 branch instead (closes #34533).

Discussion
----------

[Monolog Bridge] Fixed accessing static property as non static.

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  |  no
| Deprecations? | no
| Tickets       | Fix #34505
| License       | MIT
| Doc PR        | N/A

Commits
-------

aa045d1 [Monolog Bridge] Fixed accessing static property as non static.

src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php

@@ -39,7 +39,7 @@ public function onKernelResponse(FilterResponseEvent $event)
         }
 
         if (!preg_match(static::USER_AGENT_REGEX, $event->getRequest()->headers->get('User-Agent'))) {
-            $this->sendHeaders = false;
+            self::$sendHeaders = false;
             $this->headers = [];
 
             return;
@@ -57,7 +57,7 @@ public function onKernelResponse(FilterResponseEvent $event)
      */
     protected function sendHeader($header, $content)
     {
-        if (!$this->sendHeaders) {
+        if (!self::$sendHeaders) {
             return;
         }