Remove unused URL param

ee/app/controllers/subscriptions_controller.rb

@@ -24,7 +24,7 @@ class SubscriptionsController < ApplicationController
   def new
     return if current_user
 
-    store_location_for_user
+    store_location_for :user, request.fullpath
     redirect_to new_user_registration_path(redirect_from: 'checkout')
   end
 
@@ -85,15 +85,6 @@ class SubscriptionsController < ApplicationController
     Gitlab::SubscriptionPortal::Client
   end
 
-  def store_location_for_user
-    redirect_url = url_for(safe_params.merge(experiment_started: true))
-    store_location_for :user, redirect_url
-  end
-
-  def experiment_already_started?
-    params[:experiment_started].present?
-  end
-
   def customer_portal_new_subscription_url
     "#{EE::SUBSCRIPTIONS_URL}/subscriptions/new?plan_id=#{params[:plan_id]}&transaction=create_subscription"
   end

ee/spec/controllers/subscriptions_controller_spec.rb

@@ -15,7 +15,7 @@ describe SubscriptionsController do
       it 'stores subscription URL for later' do
         subject
 
-        expected_subscription_path = new_subscriptions_path(experiment_started: true, plan_id: 'bronze_id')
+        expected_subscription_path = new_subscriptions_path(plan_id: 'bronze_id')
 
         expect(controller.stored_location_for(:user)).to eq(expected_subscription_path)
       end