Revert "Make sure the cache is always populated"

This reverts commit 0ce7eae741.

Tests were broken https://travis-ci.org/rails/rails/jobs/131850726#L520

actionpack/lib/abstract_controller/base.rb

@@ -94,11 +94,7 @@ module AbstractController
       # ==== Returns
       # * <tt>String</tt>
       def controller_path
-        @controller_path ||= if anonymous?
-          superclass.controller_path
-        else
-          name.sub(/Controller$/, ''.freeze).underscore
-        end
+        @controller_path ||= name.sub(/Controller$/, ''.freeze).underscore unless anonymous?
       end
 
       # Refresh the cached action_methods when a new action_method is added.

actionview/lib/action_view/test_case.rb

@@ -14,7 +14,7 @@ module ActionView
       attr_accessor :request, :response, :params
 
       class << self
-        attr_accessor :controller_path
+        attr_writer :controller_path
       end
 
       def controller_path=(path)