[part 2] Make classes and structures in modules fast-allocated.

Source/modules/storage/DOMWindowStorage.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMWindowStorage_h
 #define DOMWindowStorage_h
 
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class DOMWindow;
 class ExceptionState;
 class Storage;
 
 class DOMWindowStorage final : public NoBaseWillBeGarbageCollected<DOMWindowStorage>, public WillBeHeapSupplement<LocalDOMWindow>, public DOMWindowProperty {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindowStorage);
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowStorage);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(DOMWindowStorage);
 public:
     static DOMWindowStorage& from(LocalDOMWindow&);
     static Storage* sessionStorage(DOMWindow&, ExceptionState&);
     static Storage* localStorage(DOMWindow&, ExceptionState&);
 
     Storage* sessionStorage(ExceptionState&) const;
     Storage* localStorage(ExceptionState&) const;
     Storage* optionalSessionStorage() const { return m_sessionStorage.get(); }
     Storage* optionalLocalStorage() const { return m_localStorage.get(); }
 
     DECLARE_TRACE();
 
 private:
     explicit DOMWindowStorage(LocalDOMWindow&);
     static const char* supplementName();
 
     RawPtrWillBeMember<LocalDOMWindow> m_window;
     mutable PersistentWillBeMember<Storage> m_sessionStorage;
     mutable PersistentWillBeMember<Storage> m_localStorage;
 
 };
 
 } // namespace blink
 
 #endif // DOMWindowStorage_h