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 76a24a302c90178160d158155d008397561c4a11..551b90f8b3342c27894b52338385771aac6e0f6d 100644
--- a/Source/modules/webaudio/AudioSummingJunction.cpp
+++ b/Source/modules/webaudio/AudioSummingJunction.cpp
@@ -56,11 +56,6 @@ AudioSummingJunction::~AudioSummingJunction()
 void AudioSummingJunction::trace(Visitor* visitor)
 {
     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()