Make DOMTypedArray exported.

Source/modules/webaudio/AudioBuffer.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 53 matching lines @@
     void copyFromChannel(DOMFloat32Array*, long channelNumber, unsigned long startInChannel, ExceptionState&);
     void copyToChannel(DOMFloat32Array*, long channelNumber, ExceptionState&);
     void copyToChannel(DOMFloat32Array*, long channelNumber, unsigned long startInChannel, ExceptionState&);
 
     void zero();
 
     DEFINE_INLINE_TRACE() { }
 
     virtual v8::Handle<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Handle<v8::Object> wrapper) override;
 
+private:
+    static PassRefPtr<DOMFloat32Array> createFloat32ArrayOrNull(size_t length);
+
 protected:
     AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
     explicit AudioBuffer(AudioBus*);
     bool createdSuccessfully(unsigned desiredNumberOfChannels) const;
 
     float m_sampleRate;
     size_t m_length;
 
     Vector<RefPtr<DOMFloat32Array>> m_channels;
 };
 
 } // namespace blink
 
 #endif // AudioBuffer_h