Remove LifecycleNotifier<>::m_context.

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 6352be27b770d5c2274e0aeb3056fc615bd1d9d3..0bf68af63befb4c417e068c7c83e482e62bd660b 100644
--- a/Source/core/frame/DOMWindowLifecycleNotifier.cpp
+++ b/Source/core/frame/DOMWindowLifecycleNotifier.cpp
@@ -31,11 +31,6 @@
 
 namespace blink {
 
-DOMWindowLifecycleNotifier::DOMWindowLifecycleNotifier(LocalDOMWindow* context)
-    : LifecycleNotifier<LocalDOMWindow, DOMWindowLifecycleObserver>(context)
-{
-}
-
 void DOMWindowLifecycleNotifier::notifyAddEventListener(LocalDOMWindow* window, const AtomicString& eventType)
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);