Changing type of a widget for notification popups, to remove them from Win taskbar.

ui/message_center/views/message_popup_collection.cc

Index: ui/message_center/views/message_popup_collection.cc
diff --git a/ui/message_center/views/message_popup_collection.cc b/ui/message_center/views/message_popup_collection.cc
index 2153dedf8b1bab68c2fa1536b7df2cea9918ff43..3eb2a3c3a918684e29ac37e12adb471757e36a5e 100644
--- a/ui/message_center/views/message_popup_collection.cc
+++ b/ui/message_center/views/message_popup_collection.cc
@@ -44,7 +44,7 @@ class ToastContentsView : public views::WidgetDelegateView {
 
   views::Widget* CreateWidget(gfx::NativeView parent) {
     views::Widget::InitParams params(
-        views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+        views::Widget::InitParams::TYPE_POPUP);
     params.keep_on_top = true;
     if (parent)
       params.parent = parent;