Clean up the actions a bit, move logic into actual middleware.

This is a good idea because in the future it will allow plugins to
properly override these behaviors.

plugins/providers/virtualbox/action.rb

@@ -6,7 +6,9 @@ module VagrantPlugins
       autoload :CheckAccessible, File.expand_path("../action/check_accessible", __FILE__)
       autoload :CheckVirtualbox, File.expand_path("../action/check_virtualbox", __FILE__)
       autoload :Created, File.expand_path("../action/created", __FILE__)
+      autoload :DestroyConfirm, File.expand_path("../action/destroy_confirm", __FILE__)
       autoload :MessageNotCreated, File.expand_path("../action/message_not_created", __FILE__)
+      autoload :MessageWillNotDestroy, File.expand_path("../action/message_will_not_destroy", __FILE__)
 
       # Include the built-in modules so that we can use them as top-level
       # things.
@@ -23,19 +25,12 @@ module VagrantPlugins
               next
             end
 
-            # If the VM is created, then we confirm that we want to
-            # destroy it.
-            message = I18n.t("vagrant.commands.destroy.confirmation",
-                             :name => env[:machine].name)
-            confirm = Vagrant::Action::Builder.build(Confirm, message)
-
-            b2.use Call, confirm do |env2, b3|
+            b2.use Call, DestroyConfirm do |env2, b3|
               if env2[:result]
                 b3.use Vagrant::Action::General::Validate
                 b3.use CheckAccessible
               else
-                env2[:ui].info I18n.t("vagrant.commands.destroy.will_not_destroy",
-                                      :name => env[:machine.name])
+                b3.use MessageWillNotDestroy
               end
             end
           end

plugins/providers/virtualbox/action/destroy_confirm.rb

@@ -0,0 +1,16 @@
+require "vagrant/action/builtin/confirm"
+
+module VagrantPlugins
+  module ProviderVirtualBox
+    module Action
+      class DestroyConfirm < Vagrant::Action::Builtin::Confirm
+        def initialize(app, env)
+          message = I18n.t("vagrant.commands.destroy.confirmation",
+                           :name => env[:machine].name)
+
+          super(app, env, message)
+        end
+      end
+    end
+  end
+end

plugins/providers/virtualbox/action/message_will_not_destroy.rb

@@ -0,0 +1,17 @@
+module VagrantPlugins
+  module ProviderVirtualBox
+    module Action
+      class MessageWillNotDestroy
+        def initialize(app, env)
+          @app = app
+        end
+
+        def call(env)
+          env[:ui].info I18n.t("vagrant.commands.destroy.will_not_destroy",
+                              :name => env[:machine].name)
+          @app.call(env)
+        end
+      end
+    end
+  end
+end