Remove type of panningModelType "soundfield".

Source/modules/webaudio/PannerNode.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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 33 matching lines @@
 // A distance effect will attenuate the gain as the position moves away from the listener.
 // A cone effect will attenuate the gain as the orientation moves away from the listener.
 // All of these effects follow the OpenAL specification very closely.
 
 class PannerNode FINAL : public AudioNode {
 public:
     // These must be defined as in the .idl file and must match those in the Panner class.
     enum {
         EQUALPOWER = 0,
         HRTF = 1,
-        SOUNDFIELD = 2,
     };
 
     // These must be defined as in the .idl file and must match those
     // in the DistanceEffect class.
     enum {
         LINEAR_DISTANCE = 0,
         INVERSE_DISTANCE = 1,
         EXPONENTIAL_DISTANCE = 2,
     };
 
@@ skipping 83 matching lines @@
 
     unsigned m_connectionCount;
 
     // Synchronize process() and setPanningModel() which can change the panner.
     mutable Mutex m_pannerLock;
 };
 
 } // namespace WebCore
 
 #endif // PannerNode_h