Unify and provide one IsGarbageCollectedType<T> implementation.

third_party/WebKit/Source/bindings/core/v8/OnStackObjectChecker.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 OnStackObjectChecker_h
 #define OnStackObjectChecker_h
 
 #include "core/CoreExport.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 #if ENABLE(ASSERT)
 class Dictionary;
 
 // A lifetime checker for C++ objects which must not outlive the owner of an
 // instance of this class. In general, we should rely on Oilpan or RefCounted
 // to manage object lifetime. However, we don't use them for some objects
 // (e.g. Dictionary) for performance reason. This checker is for such objects.
 // The C++ objects to be checked must call add() on creation, and remove() on
 // destruction, respectively.
 class CORE_EXPORT OnStackObjectChecker final {
     WTF_MAKE_NONCOPYABLE(OnStackObjectChecker);
 public:
-    OnStackObjectChecker() { }
+    OnStackObjectChecker();
     ~OnStackObjectChecker();
 
     void add(Dictionary*);
     void remove(Dictionary*);
 
 private:
     HashSet<Dictionary*> m_dictionaries;
 };
 #endif
 
 } // namespace blink
 
 #endif // OnStackObjectChecker_h