* lib/rubygems/commands/contents_command.rb (files_in_default_gem):
  remove useless sort. show_files will sort the result and
  another branch, files_in_gem, doesn't sort.
  it should be removed for consistency.

* test/rubygems/test_gem_commands_contents_command.rb
  (test_execute_default_gem): adjust the sort algorithm with
  Gem::Commands::ContentsCommand#show_files, which sort items
  as array of [prefix, basename] not strings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48370 b2dd03c8-39d4-4d8f-98ff-823fe69b080e