Make Widget ownership a little clearer by expressing it in terms of an enum.

chrome/browser/chromeos/notifications/balloon_view.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/notifications/balloon_view.h"
 
 #include <vector>
 
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
@@ skipping 252 matching lines @@
   }
 }
 
 void BalloonViewImpl::ViewHierarchyChanged(
     bool is_add, View* parent, View* child) {
   if (is_add && GetWidget() && !control_view_host_.get() && controls_) {
     control_view_host_.reset(new views::Widget);
     views::Widget::InitParams params(
         views::Widget::InitParams::TYPE_CONTROL);
     params.double_buffer = true;
-    params.delete_on_destroy = false;
+    params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
     params.parent = GetParentNativeView();
     control_view_host_->Init(params);
     NotificationControlView* control = new NotificationControlView(this);
     control_view_host_->SetContentsView(control);
   }
   if (!is_add && this == child && control_view_host_.get() && controls_)
     control_view_host_.release()->CloseNow();
 }
 
 gfx::Size BalloonViewImpl::GetPreferredSize() {
@@ skipping 61 matching lines @@
   service->DenyPermission(balloon_->notification().origin_url());
 }
 
 gfx::NativeView BalloonViewImpl::GetParentNativeView() {
   RenderWidgetHostView* view = html_contents_->render_view_host()->view();
   DCHECK(view);
   return view->GetNativeView();
 }
 
 }  // namespace chromeos