Remove ContextLifecycleObserver from WaitUntilObserver

third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h

Index: third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h
diff --git a/third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h b/third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h
index 1acc6d828ed32b1b5855ef0a01cca3978f2a6f0c..6d5b415425140f71d91c222cb81b371d89292604 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h
+++ b/third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.h
@@ -5,7 +5,6 @@
 #ifndef WaitUntilObserver_h
 #define WaitUntilObserver_h
 
-#include "core/dom/ContextLifecycleObserver.h"
 #include "modules/ModulesExport.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
 #include "platform/Timer.h"
@@ -21,10 +20,7 @@ class ScriptValue;
 
 // Created for each ExtendableEvent instance.
 class MODULES_EXPORT WaitUntilObserver final
-    : public GarbageCollectedFinalized<WaitUntilObserver>,
-      public ContextLifecycleObserver {
-  USING_GARBAGE_COLLECTED_MIXIN(WaitUntilObserver);
-
+    : public GarbageCollectedFinalized<WaitUntilObserver> {
  public:
   enum EventType {
     Activate,
@@ -68,6 +64,7 @@ class MODULES_EXPORT WaitUntilObserver final
 
   void consumeWindowInteraction(TimerBase*);
 
+  Member<ExecutionContext> m_executionContext;
   EventType m_type;
   int m_eventID;
   int m_pendingActivity = 0;