Attempt 2 at:...

chrome/browser/views/notifications/balloon_view.cc

 // Copyright (c) 2009 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/views/notifications/balloon_view.h"
 
 #include <vector>
 
 #include "app/gfx/canvas.h"
 #include "app/gfx/gdi_util.h"
@@ skipping 119 matching lines @@
 void BalloonViewImpl::SizeContentsWindow() {
   if (!html_container_ || !frame_container_)
     return;
 
   gfx::Rect contents_rect = GetContentsRectangle();
   html_container_->SetBounds(contents_rect);
   html_container_->MoveAbove(frame_container_);
 
   gfx::Path path;
   GetContentsMask(contents_rect, &path);
-  html_container_->SetShape(path);
+  html_container_->SetShape(path.CreateNativeRegion());
 }
 
 void BalloonViewImpl::RepositionToBalloon() {
   DCHECK(frame_container_);
   DCHECK(html_container_);
   DCHECK(balloon_);
 
   if (!kAnimateEnabled) {
     frame_container_->SetBounds(
         gfx::Rect(balloon_->position(), balloon_->size()));
@@ skipping 194 matching lines @@
     NOTREACHED();
     return;
   }
 
   // If the renderer process attached to this balloon is disconnected
   // (e.g., because of a crash), we want to close the balloon.
   notification_registrar_.Remove(this,
       NotificationType::NOTIFY_BALLOON_DISCONNECTED, Source<Balloon>(balloon_));
   Close();
 }