Add a non-null check for a pointer to NPAPIClient::ExecuteGetJavascriptUrlTest::TimerProc

webkit/plugins/npapi/test/plugin_get_javascript_url_test.cc

 // Copyright (c) 2010 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 "webkit/plugins/npapi/test/plugin_get_javascript_url_test.h"
 
 #include "base/basictypes.h"
+#include "base/logging.h"
 
 // url for "self".
 #define SELF_URL "javascript:window.location+\"\""
 // The identifier for the self url stream.
 #define SELF_URL_STREAM_ID 1
 
 // The identifier for the fetched url stream.
 #define FETCHED_URL_STREAM_ID 2
 
 // The maximum chunk size of stream data.
@@ skipping 42 matching lines @@
 
   return NPERR_NO_ERROR;
 }
 
 #ifdef OS_WIN
 void CALLBACK ExecuteGetJavascriptUrlTest::TimerProc(
     HWND window, UINT message, UINT timer_id, unsigned long elapsed_time) {
   ExecuteGetJavascriptUrlTest* this_instance =
       reinterpret_cast<ExecuteGetJavascriptUrlTest*>
           (::GetProp(window, L"Plugin_Instance"));
+  CHECK(this_instance);
 
   ::RemoveProp(window, L"Plugin_Instance");
 
   NPObject *window_obj = NULL;
   this_instance->HostFunctions()->getvalue(this_instance->id(),
                                            NPNVWindowNPObject,
                                            &window_obj);
   if (!window_obj) {
     this_instance->SetError("Failed to get NPObject for plugin instance2");
     this_instance->SignalTestCompleted();
@@ skipping 129 matching lines @@
         SetError("Failed to obtain window location.");
       SignalTestCompleted();
       break;
     default:
       SetError("Unexpected NewStream callback");
       break;
   }
 }
 
 } // namespace NPAPIClient