normal 376e57fee1 webrick/server: use symbol proc
Symbol proc is less code and avoids confusion from variable
naming.

* lib/webrick/server.rb (shutdown): use symbol proc

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56889 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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