Fixed $this usage on static functions

src/Composer/Command/ArchiveCommand.php

@@ -114,7 +114,7 @@ EOT
         } else {
             $factory = new Factory;
             $process = new ProcessExecutor();
-            $httpDownloader = $factory->createHttpDownloader($io, $config);
+            $httpDownloader = Factory::createHttpDownloader($io, $config);
             $downloadManager = $factory->createDownloadManager($io, $config, $httpDownloader, $process);
             $archiveManager = $factory->createArchiveManager($config, $downloadManager, new Loop($httpDownloader, $process));
         }

src/Composer/Repository/Vcs/GitLabDriver.php

@@ -95,7 +95,7 @@ class GitLabDriver extends VcsDriver
             ? $match['scheme']
             : (isset($this->repoConfig['secure-http']) && $this->repoConfig['secure-http'] === false ? 'http' : 'https')
         ;
-        $this->originUrl = $this->determineOrigin($configuredDomains, $guessedDomain, $urlParts, $match['port']);
+        $this->originUrl = self::determineOrigin($configuredDomains, $guessedDomain, $urlParts, $match['port']);
 
         if (false !== strpos($this->originUrl, ':') || false !== strpos($this->originUrl, '/')) {
             $this->hasNonstandardOrigin = true;