DEV: Remove initiating_user keyword arg from EmailUpdater.

The guardian contains the acting user.

app/controllers/users_email_controller.rb

@@ -35,7 +35,7 @@ class UsersEmailController < ApplicationController
     RateLimiter.new(user, "change-email-hr-#{request.remote_ip}", 6, 1.hour).performed!
     RateLimiter.new(user, "change-email-min-#{request.remote_ip}", 3, 1.minute).performed!
 
-    updater = EmailUpdater.new(guardian: guardian, user: user, initiating_user: current_user)
+    updater = EmailUpdater.new(guardian: guardian, user: user)
     updater.change_to(params[:email])
 
     if updater.errors.present?

lib/email_updater.rb

@@ -5,10 +5,9 @@ class EmailUpdater
 
   attr_reader :user
 
-  def initialize(guardian: nil, user: nil, initiating_user: nil)
+  def initialize(guardian: nil, user: nil)
     @guardian = guardian
     @user = user
-    @initiating_user = initiating_user
   end
 
   def self.human_attribute_name(name, options = {})
@@ -135,7 +134,7 @@ class EmailUpdater
   end
 
   def initiating_admin_changing_another_user_email?
-    @initiating_user&.admin? && @initiating_user != @user
+    @guardian.is_admin? && @guardian.user != @user
   end
 
   def auto_confirm_and_send_password_reset(email_token)

spec/components/email_updater_spec.rb

@@ -19,7 +19,7 @@ describe EmailUpdater do
 
   context "when an admin is changing the email of another user" do
     let(:admin) { Fabricate(:admin) }
-    let(:updater) { EmailUpdater.new(guardian: user.guardian, user: user, initiating_user: admin) }
+    let(:updater) { EmailUpdater.new(guardian: admin.guardian, user: user) }
 
     def expect_old_email_job
       Jobs.expects(:enqueue).with(:critical_user_email, has_entries(to_address: old_email, type: :notify_old_email, user_id: user.id))