Also allow prefixes as third argument to lookup context.

actionpack/lib/abstract_controller/view_paths.rb

@@ -16,9 +16,7 @@ module ViewPaths
     # information.
     def lookup_context
       @lookup_context ||=
-        ActionView::LookupContext.new(self.class._view_paths, details_for_lookup).tap do |ctx|
-          ctx.prefixes = _prefixes
-      end
+        ActionView::LookupContext.new(self.class._view_paths, details_for_lookup, _prefixes)
     end
 
     def details_for_lookup

actionpack/lib/action_view/lookup_context.rb

@@ -60,11 +60,11 @@ def initialize
       end
     end
 
-    def initialize(view_paths, details = {})
+    def initialize(view_paths, details = {}, prefixes = [])
       @details, @details_key = { :handlers => default_handlers }, nil
       @frozen_formats, @skip_default_locale = false, false
       @cache = true
-      @prefixes = []
+      @prefixes = prefixes
 
       self.view_paths = view_paths
       self.registered_detail_setters.each do |key, setter|

actionpack/lib/action_view/renderer/template_renderer.rb

@@ -20,7 +20,7 @@ def determine_template(options) #:nodoc:
       if options.key?(:text)
         Template::Text.new(options[:text], formats.try(:first))
       elsif options.key?(:file)
-        with_fallbacks { find_template(options[:file], options[:prefixes], false, keys) }
+        with_fallbacks { find_template(options[:file], nil, false, keys) }
       elsif options.key?(:inline)
         handler = Template.handler_for_extension(options[:type] || "erb")
         Template.new(options[:inline], "inline template", handler, :locals => keys)