Create DOMWindowStorage as a DOMWindowLifecycleObserver

Source/core/storage/DOMWindowStorage.h

Index: Source/core/storage/DOMWindowStorage.h
diff --git a/Source/core/frame/DeviceSingleWindowEventController.h b/Source/core/storage/DOMWindowStorage.h
similarity index 31%
copy from Source/core/frame/DeviceSingleWindowEventController.h
copy to Source/core/storage/DOMWindowStorage.h
index f90b08c4c577df6a9825c0eaa5b115c648cd9850..f631d9d74af32d679e92a80d2c473dad4ea42360 100644
--- a/Source/core/frame/DeviceSingleWindowEventController.h
+++ b/Source/core/storage/DOMWindowStorage.h
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef DeviceSingleWindowEventController_h
-#define DeviceSingleWindowEventController_h
+#ifndef DOMWindowStorage_h
+#define DOMWindowStorage_h
 
 #include "core/frame/DOMWindowLifecycleObserver.h"
-#include "core/frame/PlatformEventController.h"
+#include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
@@ -14,36 +14,26 @@ namespace blink {
 class Document;
 class Event;
 
-class DeviceSingleWindowEventController : public NoBaseWillBeGarbageCollectedFinalized<DeviceSingleWindowEventController>, public PlatformEventController, public DOMWindowLifecycleObserver {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DeviceSingleWindowEventController);
+class DOMWindowStorage : public NoBaseWillBeGarbageCollectedFinalized<DOMWindowStorage>, public WillBeHeapSupplement<Document>, public DOMWindowLifecycleObserver {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindowStorage);
 public:
-    virtual ~DeviceSingleWindowEventController();
+    virtual ~DOMWindowStorage();
 
-    // Inherited from DeviceEventControllerBase.
-    virtual void didUpdateData() override;
-    virtual void trace(Visitor*);
+    static const char* supplementName();
+    static DOMWindowStorage& from(Document&);
 
-    // Inherited from DOMWindowLifecycleObserver.
+    // Inherited from DOMWindowLifecycleObserver
     virtual void didAddEventListener(LocalDOMWindow*, const AtomicString&) override;
-    virtual void didRemoveEventListener(LocalDOMWindow*, const AtomicString&) override;
-    virtual void didRemoveAllEventListeners(LocalDOMWindow*) override;
 
 protected:
-    explicit DeviceSingleWindowEventController(Document&);
-
-    void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
-
-    virtual PassRefPtrWillBeRawPtr<Event> lastEvent() const = 0;
-    virtual const AtomicString& eventTypeName() const = 0;
-    virtual bool isNullEvent(Event*) const = 0;
+    explicit DOMWindowStorage(Document&);
 
 private:
     Document& document() const { return *m_document; }
 
-    bool m_needsCheckingNullEvents;
     RawPtrWillBeMember<Document> m_document;
 };
 
 } // namespace blink
 
-#endif // DeviceSingleWindowEventController_h
+#endif // DOMWindowStorage_h