Update destroy to use new API for VB4

CHANGELOG.md

@@ -1,6 +1,8 @@
-## 0.6.10 (unreleased)
-
+## 0.7.0 (unreleased)
 
+  - VirtualBox 4.0 support. Support for VirtualBox 3.2 is _dropped_, since
+    the API is so different. Stay with the 0.6.x series if you have VirtualBox
+    3.2.x.
 
 ## 0.6.9 (December 21, 2010)
 

lib/vagrant/action/vm/destroy.rb

@@ -8,7 +8,7 @@ module Vagrant
 
         def call(env)
           env.ui.info I18n.t("vagrant.actions.vm.destroy.destroying")
-          env["vm"].vm.destroy(:destroy_medium => :delete)
+          env["vm"].vm.destroy
           env["vm"].vm = nil
 
           @app.call(env)

test/vagrant/action/vm/destroy_test.rb

@@ -16,7 +16,7 @@ class DestroyVMActionTest < Test::Unit::TestCase
 
   context "destroying the VM" do
     should "destroy VM and attached images" do
-      @internal_vm.expects(:destroy).with(:destroy_medium => :delete).once
+      @internal_vm.expects(:destroy).once
       @env["vm"].expects(:vm=).with(nil).once
       @app.expects(:call).with(@env).once
       @instance.call(@env)