Remove blockless_step leave all that up to Ruby

Closes #6297

activesupport/lib/active_support/core_ext/range.rb

-require 'active_support/core_ext/range/blockless_step'
 require 'active_support/core_ext/range/conversions'
 require 'active_support/core_ext/range/include_range'
 require 'active_support/core_ext/range/overlaps'

activesupport/lib/active_support/core_ext/range/blockless_step.rb

-require 'active_support/core_ext/module/aliasing'
-
-class Range
-  def step_with_blockless(*args, &block) #:nodoc:
-    if block_given?
-      step_without_blockless(*args, &block)
-    else
-      step_without_blockless(*args).to_a
-    end
-  end
-
-  alias_method_chain :step, :blockless
-end

activesupport/test/core_ext/range_ext_test.rb

@@ -70,7 +70,7 @@ def test_should_include_identical_exclusive_with_floats
   end
 
   def test_blockless_step
-    assert_equal [1,3,5,7,9], (1..10).step(2)
+    assert_equal [1,3,5,7,9], (1..10).step(2).to_a
   end
 
   def test_original_step