Revert of Move DOMArrayBuffer, DOMArrayBufferViews and DataView to the heap.

third_party/WebKit/Source/modules/webaudio/AudioBuffer.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
@@ skipping 112 matching lines @@
     if (buffer->createdSuccessfully(bus->numberOfChannels()))
         return buffer;
     return nullptr;
 }
 
 bool AudioBuffer::createdSuccessfully(unsigned desiredNumberOfChannels) const
 {
     return numberOfChannels() == desiredNumberOfChannels;
 }
 
-DOMFloat32Array* AudioBuffer::createFloat32ArrayOrNull(size_t length)
+PassRefPtr<DOMFloat32Array> AudioBuffer::createFloat32ArrayOrNull(size_t length)
 {
     RefPtr<WTF::Float32Array> bufferView = WTF::Float32Array::createOrNull(length);
     if (!bufferView)
         return nullptr;
     return DOMFloat32Array::create(bufferView.release());
 }
 
 AudioBuffer::AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
     : m_sampleRate(sampleRate)
     , m_length(numberOfFrames)
 {
     m_channels.reserveCapacity(numberOfChannels);
 
     for (unsigned i = 0; i < numberOfChannels; ++i) {
-        DOMFloat32Array* channelDataArray = createFloat32ArrayOrNull(m_length);
+        RefPtr<DOMFloat32Array> channelDataArray = createFloat32ArrayOrNull(m_length);
         // If the channel data array could not be created, just return. The caller will need to
         // check that the desired number of channels were created.
-        if (!channelDataArray)
+        if (!channelDataArray) {
             return;
+        }
 
         channelDataArray->setNeuterable(false);
         m_channels.append(channelDataArray);
     }
 }
 
 AudioBuffer::AudioBuffer(AudioBus* bus)
     : m_sampleRate(bus->sampleRate())
     , m_length(bus->length())
 {
     // Copy audio data from the bus to the Float32Arrays we manage.
     unsigned numberOfChannels = bus->numberOfChannels();
     m_channels.reserveCapacity(numberOfChannels);
     for (unsigned i = 0; i < numberOfChannels; ++i) {
-        DOMFloat32Array* channelDataArray = createFloat32ArrayOrNull(m_length);
+        RefPtr<DOMFloat32Array> channelDataArray = createFloat32ArrayOrNull(m_length);
         // If the channel data array could not be created, just return. The caller will need to
         // check that the desired number of channels were created.
         if (!channelDataArray)
             return;
 
         channelDataArray->setNeuterable(false);
         const float* src = bus->channel(i)->data();
         float* dst = channelDataArray->data();
         memmove(dst, src, m_length * sizeof(*dst));
         m_channels.append(channelDataArray);
     }
 }
 
-DOMFloat32Array* AudioBuffer::getChannelData(unsigned channelIndex, ExceptionState& exceptionState)
+PassRefPtr<DOMFloat32Array> AudioBuffer::getChannelData(unsigned channelIndex, ExceptionState& exceptionState)
 {
     if (channelIndex >= m_channels.size()) {
         exceptionState.throwDOMException(IndexSizeError, "channel index (" + String::number(channelIndex) + ") exceeds number of channels (" + String::number(m_channels.size()) + ")");
         return nullptr;
     }
 
     DOMFloat32Array* channelData = m_channels[channelIndex].get();
     return DOMFloat32Array::create(channelData->buffer(), channelData->byteOffset(), channelData->length());
 }
 
@@ skipping 106 matching lines @@
     for (unsigned i = 0; i < m_channels.size(); ++i) {
         if (DOMFloat32Array* array = getChannelData(i)) {
             float* data = array->data();
             memset(data, 0, length() * sizeof(*data));
         }
     }
 }
 
 } // namespace blink