[Process] use __METHOD__ where applicable

Author: annesosensio

src/Symfony/Component/Process/Process.php

@@ -877,7 +877,7 @@ public function setStdin($stdin)
             throw new LogicException('STDIN can not be set while the process is running.');
         }
 
-        $this->stdin = ProcessUtils::validateInput(sprintf('%s::%s', __CLASS__, __FUNCTION__), $stdin);
+        $this->stdin = ProcessUtils::validateInput(__METHOD__, $stdin);
 
         return $this;
     }

src/Symfony/Component/Process/ProcessBuilder.php

@@ -156,7 +156,7 @@ public function setEnv($name, $value)
      */
     public function setInput($stdin)
     {
-        $this->stdin = ProcessUtils::validateInput(sprintf('%s::%s', __CLASS__, __FUNCTION__), $stdin);
+        $this->stdin = ProcessUtils::validateInput(__METHOD__, $stdin);
 
         return $this;
     }