Add missing null check in Database::getSecurityOrigin()

third_party/WebKit/Source/modules/webdatabase/Database.cpp

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 879 matching lines @@
 
     std::unique_ptr<DatabaseTableNamesTask> task = DatabaseTableNamesTask::create(this, &event, result);
     getDatabaseContext()->databaseThread()->scheduleTask(std::move(task));
     event.wait();
 
     return result;
 }
 
 SecurityOrigin* Database::getSecurityOrigin() const
 {
+    if (!getExecutionContext())
+        return nullptr;
     if (getExecutionContext()->isContextThread())
         return m_contextThreadSecurityOrigin.get();
     if (getDatabaseContext()->databaseThread()->isDatabaseThread())
         return m_databaseThreadSecurityOrigin.get();
-    return 0;
+    return nullptr;
 }
 
 bool Database::opened()
 {
     return static_cast<bool>(acquireLoad(&m_opened));
 }
 
 } // namespace blink