Drop [LegacyInterfaceTypeChecking] for the Web Audio API

third_party/WebKit/Source/modules/webaudio/OscillatorNode.cpp

 /*
  * Copyright (C) 2012, 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 309 matching lines @@
     }
 
     m_virtualReadIndex = virtualReadIndex;
 
     outputBus->clearSilentFlag();
 }
 
 void OscillatorHandler::setPeriodicWave(PeriodicWave* periodicWave)
 {
     ASSERT(isMainThread());
+    ASSERT(periodicWave);
 
     // This synchronizes with process().
     MutexLocker processLocker(m_processLock);
     m_periodicWave = periodicWave;
     m_type = CUSTOM;
 }
 
 bool OscillatorHandler::propagatesSilence() const
 {
     return !isPlayingOrScheduled() || hasFinished() || !m_periodicWave.get();
@@ skipping 49 matching lines @@
 }
 
 void OscillatorNode::setPeriodicWave(PeriodicWave* wave)
 {
     oscillatorHandler().setPeriodicWave(wave);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)