Sky: Add a test for the <iframe> element

sky/viewer/document_view.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/viewer/document_view.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 200 matching lines @@
                                        const mojo::Rect& new_bounds) {
   DCHECK_EQ(view, root_);
   gfx::Size size = new_bounds.To<gfx::Rect>().size();
   web_view_->resize(size);
   web_layer_tree_view_impl_->setViewportSize(size);
 }
 
 void DocumentView::OnViewDestroyed(mojo::View* view) {
   DCHECK_EQ(view, root_);
 
-  for (auto& child : root_->children())
-    child->Destroy();
-
   delete this;
 }
 
 void DocumentView::OnViewInputEvent(
     mojo::View* view, const mojo::EventPtr& event) {
   scoped_ptr<blink::WebInputEvent> web_event =
       event.To<scoped_ptr<blink::WebInputEvent> >();
   if (web_event)
     web_view_->handleInputEvent(*web_event);
 }
 
 }  // namespace sky