Use nullptr instead of 0 in WebAudio

Source/platform/audio/SincResampler.cpp

 /*
  * Copyright (C) 2011 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 59 matching lines @@
 namespace blink {
 
 SincResampler::SincResampler(double scaleFactor, unsigned kernelSize, unsigned numberOfKernelOffsets)
     : m_scaleFactor(scaleFactor)
     , m_kernelSize(kernelSize)
     , m_numberOfKernelOffsets(numberOfKernelOffsets)
     , m_kernelStorage(m_kernelSize * (m_numberOfKernelOffsets + 1))
     , m_virtualSourceIndex(0)
     , m_blockSize(512)
     , m_inputBuffer(m_blockSize + m_kernelSize) // See input buffer layout above.
-    , m_source(0)
+    , m_source(nullptr)
     , m_sourceFramesAvailable(0)
-    , m_sourceProvider(0)
+    , m_sourceProvider(nullptr)
     , m_isBufferPrimed(false)
 {
     initializeKernel();
 }
 
 void SincResampler::initializeKernel()
 {
     // Blackman window parameters.
     double alpha = 0.16;
     double a0 = 0.5 * (1.0 - alpha);
@@ skipping 371 matching lines @@
 
         // Step (4)
         // Refresh the buffer with more input.
         consumeSource(r5, m_blockSize);
     }
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)