Use nullptr instead of 0 in WebAudio

Source/platform/audio/AudioArray.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
@@ skipping 20 matching lines @@
 
 #include <string.h>
 #include "wtf/FastMalloc.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 template<typename T>
 class AudioArray {
 public:
-    AudioArray() : m_allocation(0), m_alignedData(0), m_size(0) { }
-    explicit AudioArray(size_t n) : m_allocation(0), m_alignedData(0), m_size(0)
+    AudioArray() : m_allocation(nullptr), m_alignedData(nullptr), m_size(0) { }
+    explicit AudioArray(size_t n) : m_allocation(nullptr), m_alignedData(nullptr), m_size(0)
     {
         allocate(n);
     }
 
     ~AudioArray()
     {
         fastFree(m_allocation);
     }
 
     // It's OK to call allocate() multiple times, but data will *not* be copied from an initial allocation
@@ skipping 100 matching lines @@
     T* m_alignedData;
     size_t m_size;
 };
 
 typedef AudioArray<float> AudioFloatArray;
 typedef AudioArray<double> AudioDoubleArray;
 
 } // namespace blink
 
 #endif // AudioArray_h