* lib/rdoc/*, test/rdoc/*: Update rdoc-5.0.0

Release note: b825775647/History.rdoc (500--2016-11-05)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56586 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rdoc/stats/normal.rb

@@ -1,8 +1,5 @@
 # frozen_string_literal: false
-begin
-  require 'io/console/size'
-rescue LoadError
-end
+require 'io/console/size'
 
 ##
 # Stats printer that prints just the files being documented with a progress
@@ -26,11 +23,7 @@ class RDoc::Stats::Normal < RDoc::Stats::Quiet
 
     # Print a progress bar, but make sure it fits on a single line. Filename
     # will be truncated if necessary.
-    terminal_width = if defined?(IO) && IO.respond_to?(:console_size)
-                       IO.console_size[1].to_i.nonzero? || 80
-                     else
-                       80
-                     end
+    terminal_width = IO.console_size[1].to_i.nonzero? || 80
     max_filename_size = terminal_width - progress_bar.size
 
     if filename.size > max_filename_size then
@@ -57,4 +50,3 @@ class RDoc::Stats::Normal < RDoc::Stats::Quiet
   end
 
 end
-