Move Frame to the Oilpan heap.

Source/core/frame/FrameDestructionObserver.cpp

Index: Source/core/frame/FrameDestructionObserver.cpp
diff --git a/Source/core/frame/FrameDestructionObserver.cpp b/Source/core/frame/FrameDestructionObserver.cpp
index e0aefc042261b82da708ec2972200b5ee8b07442..6c561da7b28d1136e9370b3f33caa5aeb7b41022 100644
--- a/Source/core/frame/FrameDestructionObserver.cpp
+++ b/Source/core/frame/FrameDestructionObserver.cpp
@@ -31,16 +31,17 @@
 namespace blink {
 
 FrameDestructionObserver::FrameDestructionObserver(LocalFrame* frame)
-    : m_frame(0)
+    : m_frame(nullptr)
 {
     observeFrame(frame);
 }
 
+#if !ENABLE(OILPAN)
 FrameDestructionObserver::~FrameDestructionObserver()
 {
     observeFrame(0);
-
 }
+#endif
 
 void FrameDestructionObserver::observeFrame(LocalFrame* frame)
 {
@@ -53,14 +54,21 @@ void FrameDestructionObserver::observeFrame(LocalFrame* frame)
         m_frame->addDestructionObserver(this);
 }
 
+#if !ENABLE(OILPAN)
 void FrameDestructionObserver::frameDestroyed()
 {
-    m_frame = 0;
+    m_frame = nullptr;
 }
+#endif
 
 void FrameDestructionObserver::willDetachFrameHost()
 {
     // Subclasses should override this function to handle this notification.
 }
 
+void FrameDestructionObserver::trace(Visitor* visitor)
+{
+    visitor->trace(m_frame);
+}
+
 }