rails/rails — pull request #5192 by amatsuda (2012-02-27 14:00:16+00:00)
Title: no need to rescue when requiring 'rdoc/task' in Ruby >= 1.9

This commit reverts ugly workaround ( 24b28a2a0c6a58e177b07ce3ccf56dc975541780 ) against RDoc API change.
We no more need this workaround because `require 'rdoc/task'` will never fail in Ruby '>= 1.9.3'