Rework the way Widget::Init works:

chrome/browser/ui/views/notifications/balloon_view.cc

Index: chrome/browser/ui/views/notifications/balloon_view.cc
===================================================================
--- chrome/browser/ui/views/notifications/balloon_view.cc	(revision 83020)
+++ chrome/browser/ui/views/notifications/balloon_view.cc	(working copy)
@@ -316,19 +316,20 @@
   gfx::Rect contents_rect = GetContentsRectangle();
   html_contents_.reset(new BalloonViewHost(balloon));
   html_contents_->SetPreferredSize(gfx::Size(10000, 10000));
+  html_container_ = Widget::CreateWidget();
+  html_container_->SetAlwaysOnTop(true);
   Widget::CreateParams params(Widget::CreateParams::TYPE_POPUP);
-  params.mirror_origin_in_rtl = false;
-  html_container_ = Widget::CreateWidget(params);
-  html_container_->SetAlwaysOnTop(true);
-  html_container_->Init(NULL, contents_rect);
+  params.bounds = contents_rect;
+  html_container_->Init(params);
   html_container_->SetContentsView(html_contents_->view());
 
   gfx::Rect balloon_rect(x(), y(), GetTotalWidth(), GetTotalHeight());
-  params.transparent = true;
-  frame_container_ = Widget::CreateWidget(params);
+  frame_container_ = Widget::CreateWidget();
   frame_container_->set_widget_delegate(this);
   frame_container_->SetAlwaysOnTop(true);
-  frame_container_->Init(NULL, balloon_rect);
+  params.transparent = true;
+  params.bounds = balloon_rect;
+  frame_container_->Init(params);
   frame_container_->SetContentsView(this);
   frame_container_->MoveAboveWidget(html_container_);