Revert "methods are defined right after the module_eval, so we don't need to do"

This change breaks tests in activesupport/test/core_ext/module_test.rb:

* test_delegation_exception_backtrace
* test_delegation_exception_backtrace_with_allow_nil

This reverts commit 0167765e.

activesupport/lib/active_support/core_ext/module/delegation.rb

@@ -178,7 +178,7 @@ def delegate(*methods)
       # whereas conceptually, from the user point of view, the delegator should
       # be doing one call.
       if allow_nil
-        module_eval(<<-EOS, file, line)
+        module_eval(<<-EOS, file, line - 3)
           def #{method_prefix}#{method}(#{definition})        # def customer_name(*args, &block)
             _ = #{to}                                         #   _ = client
             if !_.nil? || nil.respond_to?(:#{method})         #   if !_.nil? || nil.respond_to?(:name)
@@ -189,7 +189,7 @@ def #{method_prefix}#{method}(#{definition})        # def customer_name(*args, &
       else
         exception = %(raise DelegationError, "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}")
 
-        module_eval(<<-EOS, file, line)
+        module_eval(<<-EOS, file, line - 2)
           def #{method_prefix}#{method}(#{definition})                                          # def customer_name(*args, &block)
             _ = #{to}                                                                           #   _ = client
             _.#{method}(#{definition})                                                          #   _.name(*args, &block)