Rework the way Widget::Init works:

chrome/browser/chromeos/notifications/notification_panel.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.
 
 // Draws the view for the balloons.
 
 #include "chrome/browser/chromeos/notifications/notification_panel.h"
 
 #include <algorithm>
 
@@ skipping 55 matching lines @@
   return static_cast<chromeos::BalloonViewImpl*>(balloon->view());
 }
 
 // A WidgetGtk that covers entire ScrollView's viewport. Without this,
 // all renderer's native gtk widgets are moved one by one via
 // View::VisibleBoundsInRootChanged() notification, which makes
 // scrolling not smooth.
 class ViewportWidget : public views::WidgetGtk {
  public:
   explicit ViewportWidget(chromeos::NotificationPanel* panel)
-      : WidgetGtk(views::WidgetGtk::TYPE_CHILD),
-        panel_(panel) {
+      : panel_(panel) {
   }
 
   void UpdateControl() {
     if (last_point_.get())
       panel_->OnMouseMotion(*last_point_.get());
   }
 
   // views::WidgetGtk overrides.
   virtual gboolean OnMotionNotify(GtkWidget* widget, GdkEventMotion* event) {
     gboolean result = WidgetGtk::OnMotionNotify(widget, event);
@@ skipping 320 matching lines @@
 
 NotificationPanel::~NotificationPanel() {
   Hide();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NottificationPanel public.
 
 void NotificationPanel::Show() {
   if (!panel_widget_) {
-    // TODO(oshima): Using window because Popup widget behaves weird
-    // when resizing. This needs to be investigated.
-    views::WidgetGtk* widget_gtk =
-        new views::WidgetGtk(views::WidgetGtk::TYPE_WINDOW);
+    panel_widget_ = views::Widget::CreateWidget();
     // Enable double buffering because the panel has both pure views
     // control and native controls (scroll bar).
-    widget_gtk->EnableDoubleBuffer(true);
-    panel_widget_ = widget_gtk;
+    static_cast<views::WidgetGtk*>(panel_widget_->native_widget())->
+        EnableDoubleBuffer(true);
 
     gfx::Rect bounds = GetPreferredBounds();
     bounds = bounds.Union(min_bounds_);
-    panel_widget_->Init(NULL, bounds);
+    views::Widget::CreateParams params(
+        views::Widget::CreateParams::TYPE_WINDOW);
+    params.bounds = bounds;
+    panel_widget_->Init(params);
     // Set minimum bounds so that it can grow freely.
     gtk_widget_set_size_request(GTK_WIDGET(panel_widget_->GetNativeView()),
                                 min_bounds_.width(), min_bounds_.height());
 
     views::NativeViewHost* native = new views::NativeViewHost();
     scroll_view_->SetContents(native);
 
     panel_widget_->SetContentsView(scroll_view_.get());
 
     // Add the view port after scroll_view is attached to the panel widget.
     ViewportWidget* widget = new ViewportWidget(this);
     container_host_ = widget;
-    container_host_->Init(NULL, gfx::Rect());
+    container_host_->Init(
+        views::Widget::CreateParams(views::Widget::CreateParams::TYPE_CONTROL));
     container_host_->SetContentsView(balloon_container_.get());
     // The window_contents_ is onwed by the WidgetGtk. Increase ref count
     // so that window_contents does not get deleted when detached.
     g_object_ref(widget->window_contents());
     native->Attach(widget->window_contents());
 
     UnregisterNotification();
     panel_controller_.reset(
         new PanelController(this, GTK_WINDOW(panel_widget_->GetNativeView())));
     panel_controller_->Init(false /* don't focus when opened */,
@@ skipping 394 matching lines @@
                                   &origin);
   return rect.Contains(gfx::Rect(origin, view->size()));
 }
 
 
 bool NotificationPanelTester::IsActive(const BalloonViewImpl* view) const {
   return panel_->active_ == view;
 }
 
 }  // namespace chromeos