Create DOMWindowStorage as a DOMWindowLifecycleObserver

Source/web/FrameLoaderClientImpl.cpp

Index: Source/web/FrameLoaderClientImpl.cpp
diff --git a/Source/web/FrameLoaderClientImpl.cpp b/Source/web/FrameLoaderClientImpl.cpp
index f5941fd46d6edf0e732a110d78af8db8caf6d9c1..8fdb737dee5e3b2763c7b9637eea3f06d03df94c 100644
--- a/Source/web/FrameLoaderClientImpl.cpp
+++ b/Source/web/FrameLoaderClientImpl.cpp
@@ -50,6 +50,7 @@
 #include "core/page/Page.h"
 #include "core/page/WindowFeatures.h"
 #include "core/rendering/HitTestResult.h"
+#include "core/storage/DOMWindowStorage.h"
 #include "modules/device_light/DeviceLightController.h"
 #include "modules/device_orientation/DeviceMotionController.h"
 #include "modules/device_orientation/DeviceOrientationController.h"
@@ -128,6 +129,7 @@ void FrameLoaderClientImpl::dispatchDidClearWindowObjectInMainWorld()
             NavigatorGamepad::from(*document);
             if (RuntimeEnabledFeatures::serviceWorkerEnabled())
                 NavigatorServiceWorker::from(*document);
+            DOMWindowStorage::from(*document);
         }
     }
 }