Remove code that is no longer being used.

app/models/invite.rb

@@ -218,16 +218,6 @@ class Invite < ActiveRecord::Base
     invite
   end
 
-  def self.redeem_from_token(token, email, username=nil, name=nil, topic_id=nil)
-    invite = Invite.find_by(invite_key: token)
-    if invite
-      invite.update_column(:email, email)
-      invite.topic_invites.create!(invite_id: invite.id, topic_id: topic_id) if topic_id && Topic.find_by_id(topic_id) && !invite.topic_invites.pluck(:topic_id).include?(topic_id)
-      user = InviteRedeemer.new(invite, username, name).redeem
-    end
-    user
-  end
-
   def resend_invite
     self.update_columns(created_at: Time.zone.now, updated_at: Time.zone.now)
     Jobs.enqueue(:invite_email, invite_id: self.id)

spec/models/invite_spec.rb

@@ -465,25 +465,6 @@ describe Invite do
 
   end
 
-  describe '.redeem_from_token' do
-    let(:inviter) { Fabricate(:user) }
-    let(:invite) { Fabricate(:invite, invited_by: inviter, email: 'test@example.com', user_id: nil) }
-    let(:user) { Fabricate(:user, email: invite.email) }
-
-    it 'redeems the invite from token' do
-      Invite.redeem_from_token(invite.invite_key, user.email)
-      invite.reload
-      expect(invite).to be_redeemed
-    end
-
-    it 'does not redeem the invite if token does not match' do
-      Invite.redeem_from_token("bae0071f995bb4b6f756e80b383778b5", user.email)
-      invite.reload
-      expect(invite).not_to be_redeemed
-    end
-
-  end
-
   describe '.rescind_all_invites_from' do
     it 'removes all invites sent by a user' do
       user = Fabricate(:user)