Make classes and structures in core/dom fast-allocated.

Source/core/dom/ScopedWindowFocusAllowedIndicator.h

 // Copyright 2014 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 ScopedWindowFocusAllowedIndicator_h
 #define ScopedWindowFocusAllowedIndicator_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/ExecutionContext.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class ScopedWindowFocusAllowedIndicator final {
+    WTF_MAKE_FAST_ALLOCATED(ScopedWindowFocusAllowedIndicator);
     WTF_MAKE_NONCOPYABLE(ScopedWindowFocusAllowedIndicator);
 public:
     explicit ScopedWindowFocusAllowedIndicator(ExecutionContext* executionContext)
         : m_observer(adoptPtrWillBeNoop(new Observer(executionContext)))
     {
     }
     ~ScopedWindowFocusAllowedIndicator()
     {
         m_observer->dispose();
     }
@@ skipping 24 matching lines @@
     // In Oilpan, destructors are not allowed to touch other on-heap objects.
     // The Observer indirection is needed to keep
     // ScopedWindowFocusAllowedIndicator off-heap and thus allows its destructor
     // to call executionContext()->consumeWindowInteraction().
     OwnPtrWillBePersistent<Observer> m_observer;
 };
 
 } // namespace blink
 
 #endif // ScopedWindowFocusAllowedIndicator_h