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diff --git a/webkit/glue/plugins/test/plugin_npobject_lifetime_test.h b/webkit/glue/plugins/test/plugin_npobject_lifetime_test.h
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+++ b/webkit/glue/plugins/test/plugin_npobject_lifetime_test.h
@@ -0,0 +1,81 @@
+// 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_NPOBJECT_LIFETIME_TEST_H__
+#define WEBKIT_GLUE_PLUGINS_TEST_PLUGIN_NPOBJECT_LIFETIME_TEST_H__
+
+#include "build/build_config.h"
+#include "webkit/glue/plugins/test/plugin_test.h"
+
+namespace NPAPIClient {
+
+// The NPObjectLifeTime class tests the case where a plugin has an NPObject
+// which points to a different plugin instance on a different frame in the
+// page and whether refcounts on this npobject are valid when the source frame
+// is destroyed.
+class NPObjectLifetimeTest : public PluginTest {
+ public:
+  // Constructor.
+  NPObjectLifetimeTest(NPP id, NPNetscapeFuncs *host_functions);
+
+  // NPAPI SetWindow handler.
+  virtual NPError SetWindow(NPWindow* pNPWindow);
+
+  virtual void  URLNotify(const char* url, NPReason reason, void* data);
+
+ protected:
+  NPObject* other_plugin_instance_object_;
+
+#if defined(OS_WIN)
+  static void CALLBACK TimerProc(HWND window, UINT message, UINT timer_id,
+                                 unsigned long elapsed_milli_seconds);
+#endif
+  DISALLOW_IMPLICIT_CONSTRUCTORS(NPObjectLifetimeTest);
+};
+
+// The NPObjectLifetimeTestInstance2 class represents the plugin instance
+// which is deleted by the NPObjectLifeTime class via a javascript function.
+class NPObjectLifetimeTestInstance2 : public PluginTest {
+ public:
+  // Constructor.
+  NPObjectLifetimeTestInstance2(NPP id, NPNetscapeFuncs *host_functions);
+  ~NPObjectLifetimeTestInstance2();
+
+  // NPAPI SetWindow handler.
+  virtual NPError SetWindow(NPWindow* pNPWindow);
+ protected:
+  static NPObject* plugin_instance_object_;
+  friend class NPObjectLifetimeTest;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(NPObjectLifetimeTestInstance2);
+};
+
+// The NPObjectLifeTime class tests the case where a plugin instance is
+// destroyed in NPN_Evaluate
+class NPObjectDeletePluginInNPN_Evaluate : public PluginTest {
+ public:
+  // Constructor.
+  NPObjectDeletePluginInNPN_Evaluate(NPP id, NPNetscapeFuncs *host_functions);
+  ~NPObjectDeletePluginInNPN_Evaluate();
+
+  // NPAPI SetWindow handler.
+  virtual NPError SetWindow(NPWindow* pNPWindow);
+
+ protected:
+  NPObject* plugin_instance_object_;
+#if defined(OS_WIN)
+  static void CALLBACK TimerProc(HWND window, UINT message, UINT timer_id,
+                                 unsigned long elapsed_milli_seconds);
+#endif
+
+ private:
+  bool npn_evaluate_timer_proc_set_;
+  static NPObjectDeletePluginInNPN_Evaluate* g_npn_evaluate_test_instance_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(NPObjectDeletePluginInNPN_Evaluate);
+};
+
+} // namespace NPAPIClient
+
+#endif  // WEBKIT_GLUE_PLUGINS_TEST_PLUGIN_NPOBJECT_LIFETIME_TEST_H__