Remove unnecessary DeprecatedInstanceVariable class

activesupport/lib/active_support/deprecation.rb

@@ -176,23 +176,6 @@ def warn(callstack, called, args)
         end
     end
 
-    class DeprecatedInstanceVariable < Delegator #:nodoc:
-      def initialize(value, method)
-        @method = method
-        super(value)
-        __setobj__(value)
-      end
-
-      def __getobj__
-        ActiveSupport::Deprecation.warn("Instance variable @#{@method} is deprecated! Call instance method #{@method} instead.")
-        @value
-      end
-
-      def __setobj__(value)
-        @value = value
-      end
-    end
-
   end
 end
 

activesupport/test/deprecation_test.rb

@@ -149,13 +149,3 @@ def message
     assert_nil @last_message
   end
 end
-
-class DeprecatedIvarTest < Test::Unit::TestCase
-
-  def test_deprecated_ivar
-    @action = ActiveSupport::Deprecation::DeprecatedInstanceVariable.new("fubar", :foobar)
-
-    assert_deprecated(/Instance variable @foobar is deprecated! Call instance method foobar instead/) { assert_equal "fubar", @action }
-  end
-
-end