fix a memory leak and add a suppression

chrome/browser/ui/gtk/gtk_tree.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/gtk_tree.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/gtk/gtk_theme_service.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 367 matching lines @@
                      -1);
   return node;
 }
 
 void TreeAdapter::FillRow(GtkTreeIter* iter, ui::TreeModelNode* node) {
   GdkPixbuf* pixbuf = NULL;
   int icon_index = tree_model_->GetIconIndex(node);
   if (icon_index >= 0 && icon_index < static_cast<int>(pixbufs_.size()))
     pixbuf = pixbufs_[icon_index];
   else
-    pixbuf = GtkThemeService::GetFolderIcon(true)->ToGdkPixbuf();
+    pixbuf = GtkThemeService::GetFolderIcon(true).ToGdkPixbuf();
   gtk_tree_store_set(tree_store_, iter,
                      COL_ICON, pixbuf,
                      COL_TITLE, UTF16ToUTF8(node->GetTitle()).c_str(),
                      COL_NODE_PTR, node,
                      -1);
 }
 
 void TreeAdapter::Fill(GtkTreeIter* parent_iter,
                        ui::TreeModelNode* parent_node) {
   if (parent_iter)
@@ skipping 69 matching lines @@
 void TreeAdapter::TreeNodeChanged(ui::TreeModel* model,
                                   ui::TreeModelNode* node) {
   delegate_->OnAnyModelUpdateStart();
   GtkTreeIter iter;
   if (GetTreeIter(node, &iter))
     FillRow(&iter, node);
   delegate_->OnAnyModelUpdate();
 }
 
 }  // namespace gtk_tree