Remove ContextLifecycleObserver from PresentationConnectionList

third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp

Index: third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp b/third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp
index 669f9767950ffcf280da50161a252f1d68a0051b..dc215aa4395237e1b5f19536ca96c3065a0ebc33 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp
+++ b/third_party/WebKit/Source/modules/presentation/PresentationConnectionList.cpp
@@ -13,16 +13,12 @@ namespace blink {
 
 PresentationConnectionList::PresentationConnectionList(
     ExecutionContext* context)
-    : ContextLifecycleObserver(context) {}
+    : m_executionContext(context) {}
 
 const AtomicString& PresentationConnectionList::interfaceName() const {
   return EventTargetNames::PresentationConnectionList;
 }
 
-ExecutionContext* PresentationConnectionList::getExecutionContext() const {
-  return ContextLifecycleObserver::getExecutionContext();
-}
-
 const HeapVector<Member<PresentationConnection>>&
 PresentationConnectionList::connections() const {
   return m_connections;
@@ -55,7 +51,7 @@ bool PresentationConnectionList::isEmpty() {
 
 DEFINE_TRACE(PresentationConnectionList) {
   visitor->trace(m_connections);
-  ContextLifecycleObserver::trace(visitor);
+  visitor->trace(m_executionContext);
   EventTargetWithInlineData::trace(visitor);
 }