[WIP]Oilpan: checking for nearly-dead observers.

Source/core/frame/DOMWindowLifecycleNotifier.cpp

Index: Source/core/frame/DOMWindowLifecycleNotifier.cpp
diff --git a/Source/core/frame/DOMWindowLifecycleNotifier.cpp b/Source/core/frame/DOMWindowLifecycleNotifier.cpp
index 0bf68af63befb4c417e068c7c83e482e62bd660b..cb1c928e5b521fbaaee832dd1b161d2c81338672 100644
--- a/Source/core/frame/DOMWindowLifecycleNotifier.cpp
+++ b/Source/core/frame/DOMWindowLifecycleNotifier.cpp
@@ -34,22 +34,37 @@ namespace blink {
 void DOMWindowLifecycleNotifier::notifyAddEventListener(LocalDOMWindow* window, const AtomicString& eventType)
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
-    for (DOMWindowLifecycleObserver* observer : m_observers)
+    for (DOMWindowLifecycleObserver* observer : m_observers) {
+#if !ENABLE(OILPAN)
+        if (!isObserverAlive(observer))
+            continue;
+#endif
         observer->didAddEventListener(window, eventType);
+    }
 }
 
 void DOMWindowLifecycleNotifier::notifyRemoveEventListener(LocalDOMWindow* window, const AtomicString& eventType)
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
-    for (DOMWindowLifecycleObserver* observer : m_observers)
+    for (DOMWindowLifecycleObserver* observer : m_observers) {
+#if !ENABLE(OILPAN)
+        if (!isObserverAlive(observer))
+            continue;
+#endif
         observer->didRemoveEventListener(window, eventType);
+    }
 }
 
 void DOMWindowLifecycleNotifier::notifyRemoveAllEventListeners(LocalDOMWindow* window)
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
-    for (DOMWindowLifecycleObserver* observer : m_observers)
+    for (DOMWindowLifecycleObserver* observer : m_observers) {
+#if !ENABLE(OILPAN)
+        if (!isObserverAlive(observer))
+            continue;
+#endif
         observer->didRemoveAllEventListeners(window);
+    }
 }
 
 } // namespace blink