Use nullptr instead of 0 in WebAudio

Source/modules/webaudio/ChannelSplitterNode.cpp

 /*
  * 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 19 matching lines @@
 
 #include "modules/webaudio/AudioContext.h"
 #include "modules/webaudio/AudioNodeInput.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 
 namespace blink {
 
 ChannelSplitterNode* ChannelSplitterNode::create(AudioContext* context, float sampleRate, unsigned numberOfOutputs)
 {
     if (!numberOfOutputs || numberOfOutputs > AudioContext::maxNumberOfChannels())
-        return 0;
+        return nullptr;
 
     return new ChannelSplitterNode(context, sampleRate, numberOfOutputs);
 }
 
 ChannelSplitterNode::ChannelSplitterNode(AudioContext* context, float sampleRate, unsigned numberOfOutputs)
     : AudioNode(NodeTypeChannelSplitter, context, sampleRate)
 {
     addInput();
 
     // Create a fixed number of outputs (able to handle the maximum number of channels fed to an input).
@@ skipping 22 matching lines @@
         } else if (output(i)->renderingFanOutCount() > 0) {
             // Only bother zeroing out the destination if it's connected to anything
             destination->zero();
         }
     }
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)