Unbreak release component builds on Windows after https://codereview.chromium.org/2014343002/

third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.h

 /*
  * Copyright (C) 2010, Google 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 104 matching lines @@
     bool isAudioThread() const { return currentThread() == acquireLoad(&m_audioThread); }
 
     void lock();
     bool tryLock();
     void unlock();
 
     // This locks the audio render thread for OfflineAudioContext rendering.
     // MUST NOT be used in the real-time audio context.
     void offlineLock();
 
+#if ENABLE(ASSERT)
     // Returns true if this thread owns the context's lock.
     bool isGraphOwner();
+#endif
 
     class MODULES_EXPORT AutoLocker {
         STACK_ALLOCATED();
     public:
         explicit AutoLocker(DeferredTaskHandler& handler)
             : m_handler(handler)
         {
             m_handler.lock();
         }
         explicit AutoLocker(AbstractAudioContext*);
@@ skipping 56 matching lines @@
     Vector<RefPtr<AudioHandler>> m_deletableOrphanHandlers;
 
     // Graph locking.
     RecursiveMutex m_contextGraphMutex;
     volatile ThreadIdentifier m_audioThread;
 };
 
 } // namespace blink
 
 #endif // DeferredTaskHandler_h