[ruby-cvs:68689] k0kubun:r61508 (trunk): erb.rb: let's remove constant deprecated at 2.5

[k0kubun at ruby-lang.org]

k0kubun	2017-12-28 14:07:16 +0900 (Thu, 28 Dec 2017)

  New Revision: 61508

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=61508

  Log:
    erb.rb: let's remove constant deprecated at 2.5
    
    (r59497).

  Modified files:
    trunk/lib/erb.rb