Fix bookmark util crash

chrome/browser/gtk/bookmark_utils_gtk.cc

 // 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.
 
 #include "chrome/browser/gtk/bookmark_utils_gtk.h"
 
 #include "app/resource_bundle.h"
 #include "base/gfx/gtk_util.h"
 #include "base/pickle.h"
 #include "base/string_util.h"
@@ skipping 85 matching lines @@
   GtkWidget* floating_button = gtk_chrome_button_new();
   bookmark_utils::ConfigureButtonForNode(node, model, floating_button);
   gtk_container_add(GTK_CONTAINER(frame), floating_button);
   gtk_widget_show(floating_button);
 
   return window;
 }
 
 void ConfigureButtonForNode(const BookmarkNode* node, BookmarkModel* model,
                             GtkWidget* button) {
+  GtkWidget* former_child = gtk_bin_get_child(GTK_BIN(button));
+  if (former_child)
+    gtk_container_remove(GTK_CONTAINER(button), former_child);
+
   std::string tooltip = BuildTooltipFor(node);
   if (!tooltip.empty())
     gtk_widget_set_tooltip_text(button, tooltip.c_str());
 
   // We pack the button manually (rather than using gtk_button_set_*) so that
   // we can have finer control over its label.
   GdkPixbuf* pixbuf = bookmark_utils::GetPixbufForNode(node, model);
   GtkWidget* image = gtk_image_new_from_pixbuf(pixbuf);
   g_object_unref(pixbuf);
 
@@ skipping 90 matching lines @@
       default: {
         DLOG(ERROR) << "Unsupported drag received type: " << target_type;
       }
     }
   }
 
   return std::vector<const BookmarkNode*>();
 }
 
 }  // namespace bookmark_utils