Drupal calls should be avoided in classes, use dependency injection instead

I will work on this soon.

Here's a patch for it.

I will review it.

Reviewed the patch provided by @Shanu Chouhan. It applies cleanly and modifies the code appropriately.

I can confirm that no issues left for:
1. File::load calls should be avoided in classes, use dependency injection instead
2. \Drupal calls should be avoided in classes, use dependency injection instead

Thanks for the work. Moving it to RTBC.

Thank you for the patch. I have implemented the patch file to use dependency injection instead of classes and also fixed the following error on the new version
Argument #1 ($file_storage) must be of type Drupal\Core\Entity\EntityStorageInterface, array given