Revert r189385 "Remove LifecycleContext" and r189391, r189530, r189456 that block it

Source/core/dom/ContextLifecycleNotifier.cpp

Index: Source/core/dom/ContextLifecycleNotifier.cpp
diff --git a/Source/core/dom/ContextLifecycleNotifier.cpp b/Source/core/dom/ContextLifecycleNotifier.cpp
index 0239d7c2e40bcc20640c524c59d1c3c14985102a..b96e04260cad9482302a0008fc69db59beb6565e 100644
--- a/Source/core/dom/ContextLifecycleNotifier.cpp
+++ b/Source/core/dom/ContextLifecycleNotifier.cpp
@@ -38,6 +38,10 @@ ContextLifecycleNotifier::ContextLifecycleNotifier(ExecutionContext* context)
 {
 }
 
+ContextLifecycleNotifier::~ContextLifecycleNotifier()
+{
+}
+
 void ContextLifecycleNotifier::addObserver(ContextLifecycleNotifier::Observer* observer)
 {
     LifecycleNotifier<ExecutionContext>::addObserver(observer);
@@ -59,7 +63,7 @@ void ContextLifecycleNotifier::removeObserver(ContextLifecycleNotifier::Observer
 
 void ContextLifecycleNotifier::notifyResumingActiveDOMObjects()
 {
-    TemporaryChange<IterationType> scope(m_iterating, IteratingOverActiveDOMObjects);
+    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
     Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects;
     copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects);
     for (ActiveDOMObject* obj : snapshotOfActiveDOMObjects) {
@@ -80,7 +84,7 @@ void ContextLifecycleNotifier::notifyResumingActiveDOMObjects()
 
 void ContextLifecycleNotifier::notifySuspendingActiveDOMObjects()
 {
-    TemporaryChange<IterationType> scope(m_iterating, IteratingOverActiveDOMObjects);
+    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
     Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects;
     copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects);
     for (ActiveDOMObject* obj : snapshotOfActiveDOMObjects) {
@@ -96,7 +100,7 @@ void ContextLifecycleNotifier::notifySuspendingActiveDOMObjects()
 
 void ContextLifecycleNotifier::notifyStoppingActiveDOMObjects()
 {
-    TemporaryChange<IterationType> scope(m_iterating, IteratingOverActiveDOMObjects);
+    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
     Vector<ActiveDOMObject*> snapshotOfActiveDOMObjects;
     copyToVector(m_activeDOMObjects, snapshotOfActiveDOMObjects);
     for (ActiveDOMObject* obj : snapshotOfActiveDOMObjects) {