Remove redundant definition of Spatializer abstract class

third_party/WebKit/Source/platform/audio/StereoPanner.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/audio/StereoPanner.h"
 #include "platform/audio/AudioBus.h"
 #include "platform/audio/AudioUtilities.h"
 #include "wtf/MathExtras.h"
 #include <algorithm>
 
 // Use a 50ms smoothing / de-zippering time-constant.
 const float SmoothingTimeConstant = 0.050f;
 
 namespace blink {
 
 // Implement equal-power panning algorithm for mono or stereo input.
 // See: http://webaudio.github.io/web-audio-api/#panning-algorithm
 
-StereoPanner::StereoPanner(float sampleRate) : Spatializer(PanningModelEqualPower)
-    , m_isFirstRender(true)
+std::unique_ptr<StereoPanner> StereoPanner::create(float sampleRate)
+{
+    return wrapUnique(new StereoPanner(sampleRate));
+}
+
+StereoPanner::StereoPanner(float sampleRate)
+    : m_isFirstRender(true)
     , m_pan(0.0)
 {
     // Convert smoothing time (50ms) to a per-sample time value.
     m_smoothingConstant = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, sampleRate);
 }
 
 void StereoPanner::panWithSampleAccurateValues(const AudioBus* inputBus, AudioBus* outputBus, const float* panValues, size_t framesToProcess)
 {
     bool isInputSafe = inputBus
         && (inputBus->numberOfChannels() == 1 || inputBus->numberOfChannels() == 2)
@@ skipping 131 matching lines @@
                 // left channel only.
                 *destinationL++ = static_cast<float>(inputL * gainL);
                 *destinationR++ = static_cast<float>(inputR + inputL * gainR);
             }
         }
     }
 }
 
 } // namespace blink