WebAudio: Fix AudioNode leak in a case that AudioNode is not disconnected from the graph explicitly.

Source/modules/webaudio/AudioSummingJunction.cpp

Index: Source/modules/webaudio/AudioSummingJunction.cpp
diff --git a/Source/modules/webaudio/AudioSummingJunction.cpp b/Source/modules/webaudio/AudioSummingJunction.cpp
index d61e27fb7fbcabdf3a39db5af7ad5b4f14f54d50..03d26c80f1a5504352597e178e897e5b5c042ae9 100644
--- a/Source/modules/webaudio/AudioSummingJunction.cpp
+++ b/Source/modules/webaudio/AudioSummingJunction.cpp
@@ -56,11 +56,6 @@ AudioSummingJunction::~AudioSummingJunction()
 DEFINE_TRACE(AudioSummingJunction)
 {
     visitor->trace(m_context);
-    // FIXME: Oilpan: m_renderingOutputs should not be strong references.  This
-    // is a short-term workaround to avoid crashes, and causes AudioNode leaks.
-    AudioContext::AutoLocker locker(m_context);
-    for (size_t i = 0; i < m_renderingOutputs.size(); ++i)
-        visitor->trace(m_renderingOutputs[i]);
 }
 
 void AudioSummingJunction::changedOutputs()