code: public boolean containsFiles(
        java.lang.String key) {
      if (key == null) { throw new java.lang.NullPointerException(); }
      return internalGetFiles().getMap().containsKey(key);
    }
docs: <pre>
  Manifest of the files stored in Google Cloud Storage that are included
  as part of this version. All files must be readable using the
  credentials supplied with this call.
  </pre>
  
  <code>map&lt;string, .google.appengine.v1.FileInfo&gt; files = 1;</code>