@Override
 public boolean shouldOverrideRunFileChooser(
     int processId, int renderId, int mode, String acceptTypes, boolean capture) {
   if (mXWalkContentsClient != null) {
     return mXWalkContentsClient.shouldOverrideRunFileChooser(
         processId, renderId, mode, acceptTypes, capture);
   }
   return false;
 }