fix a memory leak and add a suppression

chrome/browser/ui/gtk/task_manager_gtk.cc

 // Copyright (c) 2012 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/ui/gtk/task_manager_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 701 matching lines @@
       return std::string();
   }
 }
 
 GdkPixbuf* TaskManagerGtk::GetModelIcon(int row) {
   SkBitmap icon = model_->GetResourceIcon(row);
   if (icon.pixelRef() ==
       ui::ResourceBundle::GetSharedInstance().GetBitmapNamed(
           IDR_DEFAULT_FAVICON)->pixelRef()) {
     return static_cast<GdkPixbuf*>(g_object_ref(
-        GtkThemeService::GetDefaultFavicon(true)->ToGdkPixbuf()));
+        GtkThemeService::GetDefaultFavicon(true).ToGdkPixbuf()));
   }
 
   return gfx::GdkPixbufFromSkBitmap(icon);
 }
 
 void TaskManagerGtk::SetRowDataFromModel(int row, GtkTreeIter* iter) {
   GdkPixbuf* icon = GetModelIcon(row);
   std::string task = GetModelText(row, IDS_TASK_MANAGER_TASK_COLUMN);
   std::string profile_name =
       GetModelText(row, IDS_TASK_MANAGER_PROFILE_NAME_COLUMN);
@@ skipping 234 matching lines @@
                                           guint keyval,
                                           GdkModifierType modifier) {
   if (keyval == GDK_w && modifier == GDK_CONTROL_MASK) {
     // The GTK_RESPONSE_DELETE_EVENT response must be sent before the widget
     // is destroyed.  The deleted object will receive gtk signals otherwise.
     gtk_dialog_response(GTK_DIALOG(dialog_), GTK_RESPONSE_DELETE_EVENT);
   }
 
   return TRUE;
 }