Allow assertions to be enabled in Blink Release builds.

Source/modules/webdatabase/DatabaseThread.cpp

 /*
  * Copyright (C) 2007, 2008, 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
@@ skipping 77 matching lines @@
     MutexLocker lock(m_terminationRequestedMutex);
     ASSERT(!m_terminationRequested);
     m_terminationRequested = true;
     m_cleanupSync = cleanupSync;
     WTF_LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this);
     m_thread->postTask(new Task(WTF::bind(&DatabaseThread::cleanupDatabaseThread, this)));
 }
 
 bool DatabaseThread::terminationRequested(TaskSynchronizer* taskSynchronizer) const
 {
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     if (taskSynchronizer)
         taskSynchronizer->setHasCheckedForTermination();
 #endif
 
     MutexLocker lock(m_terminationRequestedMutex);
     return m_terminationRequested;
 }
 
 void DatabaseThread::cleanupDatabaseThread()
 {
@@ skipping 54 matching lines @@
 
 void DatabaseThread::scheduleTask(PassOwnPtr<DatabaseTask> task)
 {
     ASSERT(m_thread);
     ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination());
     // WebThread takes ownership of the task.
     m_thread->postTask(task.leakPtr());
 }
 
 } // namespace WebCore