Oilpan: WebAudio: Apply the weak HashMap pattern to remove an entry from AudioContext::m_dirtyAudio…

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 f75df62584992f29b40ffac2b99ec562173ecdbe..12e5a300995f4b81a74530d7c2b032255ab0e417 100644
--- a/Source/modules/webaudio/AudioSummingJunction.cpp
+++ b/Source/modules/webaudio/AudioSummingJunction.cpp
@@ -38,14 +38,18 @@ AudioSummingJunction::AudioSummingJunction(AudioContext* context)
     : m_context(context)
     , m_renderingStateNeedUpdating(false)
 {
+    ASSERT(context);
+#if ENABLE(OILPAN)
+    m_context->registerLiveAudioSummingJunction(*this);
+#endif
 }
 
 AudioSummingJunction::~AudioSummingJunction()
 {
-    // Oilpan: m_context is null if AudioContext and this object die
-    // together. It's non-null if this object dies before AudioContext.
+#if !ENABLE(OILPAN)
     if (m_renderingStateNeedUpdating && m_context.get())
         m_context->removeMarkedSummingJunction(this);
+#endif
 }
 
 void AudioSummingJunction::trace(Visitor* visitor)