Remove deprecation notice for GoogleCloudStorage

It should be re-added when KnpLabs#427 is merged.

src/Gaufrette/Adapter/GoogleCloudStorage.php

@@ -5,14 +5,10 @@
 use Gaufrette\Adapter;
 use GuzzleHttp;
 
-@trigger_error('The '.__NAMESPACE__.'\GoogleCloudStorage adapter is deprecated since version 0.4 and will be removed in 1.0.', E_USER_DEPRECATED);
-
 /**
  * Google Cloud Storage adapter using the Google APIs Client Library for PHP.
  *
  * @author  Patrik Karisch <[email protected]>
- *
- * @deprecated The GoogleCloudStorage adapter is deprecated since version 0.4 and will be removed in 1.0.
  */
 class GoogleCloudStorage implements Adapter,
                                     MetadataSupporter,