Fix browser hang due to plugin deadlock...

webkit/glue/plugins/test/plugin_windowless_test.h

 // 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.
 
 #ifndef WEBKIT_GLUE_PLUGINS_TEST_PLUGIN_EXECUTE_SCRIPT_DELETE_TEST_H
 #define WEBKIT_GLUE_PLUGINS_TEST_PLUGIN_EXECUTE_SCRIPT_DELETE_TEST_H
 
 #include "webkit/glue/plugins/test/plugin_test.h"
 
 namespace NPAPIClient {
 
 // This class contains a list of windowless plugin tests. Please add additional
 // tests to this class.
 class WindowlessPluginTest : public PluginTest {
  public:
   // Constructor.
   WindowlessPluginTest(NPP id, NPNetscapeFuncs *host_functions,
                        const std::string& test_name);
   // NPAPI HandleEvent handler
   virtual int16 HandleEvent(void* event);
 
+ protected:
+  NPError ExecuteScript(NPNetscapeFuncs* browser, NPP id,
+      const std::string& script, NPVariant* result);
+  void ExecuteScriptDeleteInPaint(NPNetscapeFuncs* browser);
+  void MultipleInstanceSyncCalls(NPNetscapeFuncs* browser);
+
  private:
   std::string test_name_;
 };
 
 } // namespace NPAPIClient
 
 #endif  // WEBKIT_GLUE_PLUGINS_TEST_PLUGIN_EXECUTE_SCRIPT_DELETE_TEST_H