Make all controllers inherit from a single DeviseController

app/controllers/devise/confirmations_controller.rb

@@ -1,4 +1,4 @@
-class Devise::ConfirmationsController < ApplicationController
+class Devise::ConfirmationsController < DeviseController
   include Devise::Controllers::InternalHelpers
 
   # GET /resource/confirmation/new

app/controllers/devise/omniauth_callbacks_controller.rb

@@ -1,4 +1,4 @@
-class Devise::OmniauthCallbacksController < ApplicationController
+class Devise::OmniauthCallbacksController < DeviseController
   include Devise::Controllers::InternalHelpers
 
   def failure

app/controllers/devise/passwords_controller.rb

@@ -1,4 +1,4 @@
-class Devise::PasswordsController < ApplicationController
+class Devise::PasswordsController < DeviseController
   prepend_before_filter :require_no_authentication
   include Devise::Controllers::InternalHelpers
 

app/controllers/devise/registrations_controller.rb

@@ -1,4 +1,4 @@
-class Devise::RegistrationsController < ApplicationController
+class Devise::RegistrationsController < DeviseController
   prepend_before_filter :require_no_authentication, :only => [ :new, :create, :cancel ]
   prepend_before_filter :authenticate_scope!, :only => [:edit, :update, :destroy]
   include Devise::Controllers::InternalHelpers

app/controllers/devise/sessions_controller.rb

@@ -1,4 +1,4 @@
-class Devise::SessionsController < ApplicationController
+class Devise::SessionsController < DeviseController
   prepend_before_filter :require_no_authentication, :only => [ :new, :create ]
   include Devise::Controllers::InternalHelpers
 

app/controllers/devise/unlocks_controller.rb

@@ -1,4 +1,4 @@
-class Devise::UnlocksController < ApplicationController
+class Devise::UnlocksController < DeviseController
   prepend_before_filter :require_no_authentication
   include Devise::Controllers::InternalHelpers
 

app/controllers/devise_controller.rb

@@ -0,0 +1,3 @@
+# All Devise controllers are inherited from here.
+class DeviseController < ApplicationController
+end