Remove connection from AudioParamHandler to AudioContext.

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

Index: third_party/WebKit/Source/modules/webaudio/AudioParam.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioParam.cpp b/third_party/WebKit/Source/modules/webaudio/AudioParam.cpp
index 9e494295098ff1dd98dd3165cfd0f13f8a219003..c474744e9102ac5de5f0c395a064f54068bee852 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioParam.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioParam.cpp
@@ -35,12 +35,9 @@ namespace blink {
 const double AudioParamHandler::DefaultSmoothingConstant = 0.05;
 const double AudioParamHandler::SnapThreshold = 0.001;
 
-AbstractAudioContext* AudioParamHandler::context() const
+AudioDestinationHandler* AudioParamHandler::context() const
 {
-    // TODO(tkent): We can remove this dangerous function by removing
-    // AbstractAudioContext dependency from AudioParamTimeline.
-    ASSERT_WITH_SECURITY_IMPLICATION(deferredTaskHandler().isAudioThread());
-    return m_context;
+    return &m_destination;
 }
 
 float AudioParamHandler::value()