Remove unused symfony dependencies and FileTextExtractor::get_mime

composer.json

@@ -23,9 +23,7 @@
         "silverstripe/framework": "^4",
         "silverstripe/assets": "^1",
         "silverstripe/versioned": "^1",
-        "guzzlehttp/guzzle": "~6.3.0",
-        "symfony/event-dispatcher": "^2.6.0@stable",
-        "symfony/http-foundation": "^2.6.0"
+        "guzzlehttp/guzzle": "~6.3.0"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^3",

src/Extractor/FileTextExtractor.php

@@ -73,19 +73,6 @@ abstract class FileTextExtractor
         return Injector::inst()->get($class);
     }
 
-    /**
-     * Attempt to detect mime type for given file
-     *
-     * @param string $path
-     * @return string Mime type if found
-     */
-    protected static function get_mime($path)
-    {
-        $file = new \Symfony\Component\HttpFoundation\File\File($path);
-
-        return $file->getMimeType();
-    }
-
     /**
      * Given a File object, decide which extractor instance to use to handle it
      *