Rework the way Widget::Init works:

chrome/browser/chromeos/login/helper.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/login/helper.h"
 
 #include "base/file_util.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
 #include "chrome/browser/chromeos/customization_document.h"
 #include "chrome/browser/google/google_util.h"
@@ skipping 90 matching lines @@
     host_gtk_window = gtk_widget_get_parent(host_gtk_window);
   if (!host_gtk_window) {
     LOG(WARNING) << "Failed to start the throbber: no GtkWindow";
     return;
   }
 
   views::SmoothedThrobber* throbber = CreateDefaultSmoothedThrobber();
   throbber->set_stop_delay_ms(0);
   gfx::Rect throbber_bounds = CalculateThrobberBounds(throbber);
 
+  throbber_widget_ = views::Widget::CreateWidget();
+  static_cast<views::WidgetGtk*>(throbber_widget_->native_widget())->
+      make_transient_to_parent();
+
+  throbber_bounds.Offset(host_view_->GetScreenBounds().origin());
   views::Widget::CreateParams params(views::Widget::CreateParams::TYPE_WINDOW);
   params.transparent = true;
-  throbber_widget_ = views::Widget::CreateWidget(params);
-  static_cast<views::WidgetGtk*>(throbber_widget_)->make_transient_to_parent();
-
-  throbber_bounds.Offset(host_view_->GetScreenBounds().origin());
-  throbber_widget_->Init(host_gtk_window, throbber_bounds);
+  params.bounds = throbber_bounds;
+  params.parent = host_gtk_window;
+  throbber_widget_->Init(params);
   throbber_widget_->SetContentsView(throbber);
   // This keeps the window from flashing at startup.
   gdk_window_set_back_pixmap(
       throbber_widget_->GetNativeView()->window, NULL, false);
   throbber_widget_->Show();
   // WM can ignore bounds before widget is shown.
   throbber_widget_->SetBounds(throbber_bounds);
   throbber->Start();
 }
 
@@ skipping 120 matching lines @@
   gfx::Size preferred_size = NativeButton::GetPreferredSize();
   // Set minimal width.
   if (preferred_size.width() < kButtonMinWidth)
     preferred_size.set_width(kButtonMinWidth);
   return preferred_size;
 }
 
 }  // namespace login
 
 }  // namespace chromeos