Rewrite references to "wtf/" to "platform/wtf/" in platform/audio.

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 <algorithm>
 #include "platform/audio/AudioBus.h"
 #include "platform/audio/AudioUtilities.h"
-#include "wtf/MathExtras.h"
-#include <algorithm>
+#include "platform/wtf/MathExtras.h"
 
 // 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
 
 std::unique_ptr<StereoPanner> StereoPanner::create(float sampleRate) {
@@ skipping 152 matching lines @@
         // When [0; 1], keep right channel intact and equal-power pan the
         // left channel only.
         *destinationL++ = static_cast<float>(inputL * gainL);
         *destinationR++ = static_cast<float>(inputR + inputL * gainR);
       }
     }
   }
 }
 
 }  // namespace blink