Make DOMWindowProperty a thin wrapper of ContextLifecycleObserver

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

Index: third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp b/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
index f605ba9ceb92849aae9a6155c5973d2ca7f8e03e..b0e6a7957d850fcef18d0c048b3fc7938cc17c4f 100644
--- a/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
@@ -473,24 +473,12 @@ MediaQueryList* LocalDOMWindow::matchMedia(const String& media) {
                     : nullptr;
 }
 
-void LocalDOMWindow::frameDestroyed() {
-  for (const auto& domWindowProperty : m_properties)
-    domWindowProperty->frameDestroyed();
-
+void LocalDOMWindow::contextDestroyed() {
   resetLocation();
-  m_properties.clear();
   removeAllEventListeners();
   m_frame = nullptr;
 }
 
-void LocalDOMWindow::registerProperty(DOMWindowProperty* property) {
-  m_properties.add(property);
-}
-
-void LocalDOMWindow::unregisterProperty(DOMWindowProperty* property) {
-  m_properties.remove(property);
-}
-
 void LocalDOMWindow::registerEventListenerObserver(
     EventListenerObserver* eventListenerObserver) {
   m_eventListenerObservers.add(eventListenerObserver);
@@ -501,7 +489,7 @@ void LocalDOMWindow::reset() {
   // Since |Document| class has multiple |LifecycleNotifier| as base class,
   // we need to have |static_cast<ExecutionContext>| here.
   static_cast<ExecutionContext*>(document())->notifyContextDestroyed();
-  frameDestroyed();
+  contextDestroyed();
 
   m_screen = nullptr;
   m_history = nullptr;
@@ -1544,7 +1532,6 @@ DOMWindow* LocalDOMWindow::open(const String& urlString,
 DEFINE_TRACE(LocalDOMWindow) {
   visitor->trace(m_frame);
   visitor->trace(m_document);
-  visitor->trace(m_properties);
   visitor->trace(m_screen);
   visitor->trace(m_history);
   visitor->trace(m_locationbar);