Move files in wtf/ to platform/wtf/ (Part 2).

third_party/WebKit/Source/wtf/ConditionalDestructor.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
+// Copyright 2017 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 ConditionalDestructor_h
-#define ConditionalDestructor_h
+#include "platform/wtf/ConditionalDestructor.h"
 
-namespace WTF {
-
-// ConditionalDestructor defines the destructor of the derived object.
-// This base is used in order to completely avoid creating a destructor
-// for an object that does not need to be destructed. By doing so,
-// the clang compiler will have correct information about whether or not
-// the object has a trivial destructor.
-// Note: the derived object MUST release all its recources at the finalize()
-// method.
-template <typename Derived, bool noDestructor>
-class ConditionalDestructor {
- public:
-  ~ConditionalDestructor() { static_cast<Derived*>(this)->finalize(); }
-};
-
-template <typename Derived>
-class ConditionalDestructor<Derived, true> {};
-
-}  // namespace WTF
-
-#endif  // ConditionalDestructor_h
+// The contents of this header was moved to platform/wtf as part of
+// WTF migration project. See the following post for details:
+// https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gYCAAJ