Unref the GC so it's destroy after we create it.

chrome/browser/autocomplete/autocomplete_popup_view_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/autocomplete/autocomplete_popup_view_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 
@@ skipping 451 matching lines @@
                           is_selected ? &kDescriptionSelectedTextColor :
                               &kDescriptionTextColor,
                           std::string(" - "));
 
       gdk_draw_layout(drawable, gc,
                       kIconAreaWidth + actual_content_width, content_y,
                       layout_);
     }
   }
 
+  g_object_unref(gc);
+
   return TRUE;
 }