title: Delete a file from firebase storage using download url with Cloud Functions
body: <p>I have a collection of profiles in my Firestore db and a field named "profilePicture" with a downloadUrl as the value.</p>
  
  <p>Im using cloud functions and been trying for a long time to figure out how to delete the profilePicture when the profile is deleted. </p>
  
  <p>I know how to create a trigger when the profile is deleted and get the profile picture downloadUrl, but how do I delete the file from storage with only the downloadUrl?</p>