Remove private partial/template renderer methods

Since now these objects are not cached anymore, there's no need to have
these private methods, just instantiate each of them in the necessary
place.

actionpack/lib/action_view/renderer/partial_renderer.rb

-
 module ActionView
   # = Action View Partials
   #

actionpack/lib/action_view/renderer/renderer.rb

@@ -33,22 +33,12 @@ def render_body(context, options)
 
     # Direct accessor to template rendering.
     def render_template(context, options) #:nodoc:
-      _template_renderer.render(context, options)
+      TemplateRenderer.new(@lookup_context).render(context, options)
     end
 
     # Direct access to partial rendering.
     def render_partial(context, options, &block) #:nodoc:
-      _partial_renderer.render(context, options, block)
-    end
-
-    private
-
-    def _template_renderer #:nodoc:
-      TemplateRenderer.new(@lookup_context)
-    end
-
-    def _partial_renderer #:nodoc:
-      PartialRenderer.new(@lookup_context)
+      PartialRenderer.new(@lookup_context).render(context, options, block)
     end
   end
 end

actionpack/lib/action_view/renderer/template_renderer.rb

@@ -41,7 +41,7 @@ def determine_template(options) #:nodoc:
 
     # Renders the given template. A string representing the layout can be
     # supplied as well.
-    def render_template(template, layout_name = nil, locals = {}) #:nodoc:
+    def render_template(template, layout_name = nil, locals = nil) #:nodoc:
       view, locals = @view, locals || {}
 
       render_with_layout(layout_name, locals) do |layout|