Rework the way Widget::Init works:

views/window/window_gtk.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 "views/window/window_gtk.h"
 
 #include "base/i18n/rtl.h"
 #include "base/utf_string_conversions.h"
 #include "ui/gfx/gtk_util.h"
 #include "ui/gfx/path.h"
@@ skipping 390 matching lines @@
 void WindowGtk::FrameTypeChanged() {
   // This is called when the Theme has changed, so forward the event to the root
   // widget.
   ThemeChanged();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowGtk, protected:
 
 WindowGtk::WindowGtk(WindowDelegate* window_delegate)
-    : WidgetGtk(TYPE_WINDOW),
-      Window(window_delegate),
+    : Window(window_delegate),
       ALLOW_THIS_IN_INITIALIZER_LIST(delegate_(this)),
       window_state_(GDK_WINDOW_STATE_WITHDRAWN),
       window_closed_(false) {
   SetNativeWindow(this);
   is_window_ = true;
 }
 
 void WindowGtk::InitWindow(GtkWindow* parent, const gfx::Rect& bounds) {
   if (parent)
     make_transient_to_parent();
-  WidgetGtk::Init(GTK_WIDGET(parent), bounds);
+  Widget::CreateParams params(Widget::CreateParams::TYPE_WINDOW);
+  params.parent = GTK_WIDGET(parent);
+  params.bounds = bounds;
+  GetWidget()->Init(params);
   delegate_->OnNativeWindowCreated(bounds);
 
   g_signal_connect(G_OBJECT(GetNativeWindow()), "configure-event",
                    G_CALLBACK(CallConfigureEvent), this);
   g_signal_connect(G_OBJECT(GetNativeWindow()), "window-state-event",
                    G_CALLBACK(CallWindowStateEvent), this);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowGtk, private:
@@ skipping 21 matching lines @@
   GetWindow()->window_delegate()->SaveWindowPlacement(GetBounds(), maximized);
 }
 
 void WindowGtk::OnDestroy(GtkWidget* widget) {
   delegate_->OnNativeWindowDestroying();
   WidgetGtk::OnDestroy(widget);
   delegate_->OnNativeWindowDestroyed();
 }
 
 }  // namespace views