Unify and provide one IsGarbageCollectedType<T> implementation.

third_party/WebKit/Source/bindings/core/v8/OnStackObjectChecker.cpp

 // 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.
 
 #include "bindings/core/v8/OnStackObjectChecker.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 #if ENABLE(ASSERT)
+OnStackObjectChecker::OnStackObjectChecker()
+{
+}
+
 OnStackObjectChecker::~OnStackObjectChecker()
 {
     // All dictionaries must be removed before the checker is destructed.
     ASSERT(m_dictionaries.isEmpty());
 }
 
 void OnStackObjectChecker::add(Dictionary* dictionary)
 {
     m_dictionaries.add(dictionary);
 }
 
 void OnStackObjectChecker::remove(Dictionary* dictionary)
 {
     m_dictionaries.remove(dictionary);
 }
 #endif // ENABLE(ASSERT)
 
 } // namespace blink