Remove unused Block#end_tag method.

Although the method is called, it is defined with an empty body and not
overridden to do anything else.

lib/liquid/block.rb

@@ -24,10 +24,7 @@ module Liquid
 
             # if we found the proper block delimiter just end parsing here and let the outer block
             # proceed
-            if block_delimiter == $1
+            return if block_delimiter == $1
-              end_tag
-              return
-            end
 
             # fetch the tag from registered blocks
             if tag = Template.tags[$1]
@@ -74,9 +71,6 @@ module Liquid
       all_warnings
     end
 
-    def end_tag
-    end
-
     def unknown_tag(tag, params, tokens)
       case tag
       when 'else'.freeze

lib/liquid/tags/raw.rb

@@ -8,10 +8,7 @@ module Liquid
       while token = tokens.shift
         if token =~ FullTokenPossiblyInvalid
           @nodelist << $1 if $1 != "".freeze
-          if block_delimiter == $2
+          return if block_delimiter == $2
-            end_tag
-            return
-          end
         end
         @nodelist << token if not token.empty?
       end