Assert destination handler exists in AudioParam

third_party/WebKit/Source/modules/webaudio/AudioParam.h

Index: third_party/WebKit/Source/modules/webaudio/AudioParam.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioParam.h b/third_party/WebKit/Source/modules/webaudio/AudioParam.h
index 42bffe793b960d2e3a94a66092b39c76a47f341a..dd000e52002d243411e779fa44af09c838e23993 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioParam.h
+++ b/third_party/WebKit/Source/modules/webaudio/AudioParam.h
@@ -128,14 +128,7 @@ public:
 
     float intrinsicValue() const { return noBarrierLoad(&m_intrinsicValue); }
 private:
-    AudioParamHandler(AbstractAudioContext& context, AudioParamType paramType, double defaultValue)
-        : AudioSummingJunction(context.deferredTaskHandler())
-        , m_paramType(paramType)
-        , m_intrinsicValue(defaultValue)
-        , m_defaultValue(defaultValue)
-        , m_smoothedValue(defaultValue)
-        , m_destinationHandler(context.destination()->audioDestinationHandler())
-    { }
+    AudioParamHandler(AbstractAudioContext&, AudioParamType, double defaultValue);
 
     // sampleAccurate corresponds to a-rate (audio rate) vs. k-rate in the Web Audio specification.
     void calculateFinalValues(float* values, unsigned numberOfValues, bool sampleAccurate);