Do no use custom gtkrc files in layout test mode....

webkit/tools/test_shell/test_shell_main.cc

 // Copyright (c) 2006-2008 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.
 
 // Creates an instance of the test_shell.
 #include "build/build_config.h"
 
 #include <stdlib.h>  // required by _set_abort_behavior
 
 #if defined(OS_WIN)
@@ skipping 214 matching lines @@
   TestShell::InitializeTestShell(layout_test_mode);
 
   if (parsed_command_line.HasSwitch(test_shell::kAllowScriptsToCloseWindows))
     TestShell::SetAllowScriptsToCloseWindows();
 
   // Disable user themes for layout tests so pixel tests are consistent.
   if (layout_test_mode) {
 #if defined(OS_WIN)
     gfx::NativeTheme::instance()->DisableTheming();
 #elif defined(OS_LINUX)
+    // Stop custom gtkrc files from messing with the theme.
+    gchar *default_gtkrc_files[] = { NULL };

[Evan Martin, 2009/01/24 01:39:20]

star on the left (gchar* default...)

+    gtk_rc_set_default_files(default_gtkrc_files);
+    gtk_rc_reparse_all_for_settings(gtk_settings_get_default(), TRUE);
+
     // Pick a theme that uses Cairo for drawing, since we:
     // 1) currently don't support GTK themes that use the GDK drawing APIs, and
     // 2) need to use a unified theme for layout tests anyway.
     g_object_set(gtk_settings_get_default(),
                  "gtk-theme-name", "Mist",
                  NULL);
 #endif
   }
 
   if (parsed_command_line.HasSwitch(test_shell::kTestShellTimeOut)) {
@@ skipping 150 matching lines @@
 
   // Tear down shared StatsTable; prevents unit_tests from leaking it.
   StatsTable::set_current(NULL);
   delete table;
 
 #ifdef _CRTDBG_MAP_ALLOC
   _CrtDumpMemoryLeaks();
 #endif
   return 0;
 }