This helpers are useless outside oauth context.

lib/devise/oauth/helpers.rb

@@ -5,15 +5,6 @@ module Devise
     module Helpers
       extend ActiveSupport::Concern
 
-      included do
-        helper_method :oauth_callback
-      end
-
-      def oauth_callback #:nodoc:
-        nil
-      end
-      alias :oauth_provider :oauth_callback
-
     protected
 
       # Overwrite expire_session_data_after_sign_in! so it removes all

lib/devise/oauth/internal_helpers.rb

@@ -9,7 +9,7 @@ module Devise
       end
 
       included do
-        helpers = %w(oauth_config)
+        helpers = %w(oauth_callback oauth_provider oauth_config)
         hide_action *helpers
         helper_method *helpers
         before_filter :valid_oauth_callback?, :oauth_error_happened?