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

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

Index: third_party/WebKit/Source/modules/webaudio/AudioBuffer.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioBuffer.cpp b/third_party/WebKit/Source/modules/webaudio/AudioBuffer.cpp
index 03c17f4ae1e05add492db138c2f3513f0e6fa186..be4f480e8222ba06ca4ec9ebb1a4df839c9072a6 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioBuffer.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioBuffer.cpp
@@ -130,7 +130,7 @@
     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)
@@ -145,11 +145,12 @@
     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);
@@ -164,7 +165,7 @@
     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)
@@ -178,7 +179,7 @@
     }
 }
 
-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()) + ")");