gtk: Make GtkThemeProvider own the gtk label widget. The widget is not added...

chrome/browser/gtk/gtk_theme_provider.h

 // 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.
 
 #ifndef CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_
 #define CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_
 
 #include <vector>
 
 #include "chrome/browser/browser_theme_provider.h"
 #include "chrome/common/notification_observer.h"
+#include "chrome/common/owned_widget_gtk.h"
 
 #include "skia/ext/skia_utils.h"
 
 class Profile;
 
 typedef struct _GtkStyle GtkStyle;
 typedef struct _GtkWidget GtkWidget;
 
 // Specialization of BrowserThemeProvider which supplies system colors.
 class GtkThemeProvider : public BrowserThemeProvider,
@@ skipping 64 matching lines @@
   // remove it from our internal list.
   static void OnDestroyChromeButton(GtkWidget* button,
                                     GtkThemeProvider* provider);
 
   // Whether we should be using gtk rendering.
   bool use_gtk_;
 
   // GtkWidgets that exist only so we can look at their properties (and take
   // their colors).
   GtkWidget* fake_window_;
-  GtkWidget* fake_label_;
+  OwnedWidgetGtk fake_label_;
 
   // A list of all GtkChromeButton instances. We hold on to these to notify
   // them of theme changes.
   std::vector<GtkWidget*> chrome_buttons_;
 };
 
 #endif  // CHROME_BROWSER_GTK_GTK_THEME_PROVIDER_H_