Move files in wtf/ to platform/wtf/ (Part 3).

third_party/WebKit/Source/wtf/SizeAssertions.h

-// Copyright 2016 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 WTF_SizeAssertions_h
-#define WTF_SizeAssertions_h
+#include "platform/wtf/SizeAssertions.h"
 
-namespace WTF {
-
-// The ASSERT_SIZE macro can be used to check that a given struct is the same
-// size as a class. This is useful to visualize where the space is being used in
-// a class, as well as give a useful compile error message when the size doesn't
-// match the expected value.
-template <class T, class U>
-struct assert_size {
-  template <int ActualSize, int ExpectedSize>
-  struct assertSizeEqual {
-    static_assert(ActualSize == ExpectedSize, "Class should stay small");
-    static const bool innerValue = true;
-  };
-  static const bool value = assertSizeEqual<sizeof(T), sizeof(U)>::innerValue;
-};
-
-}  // namespace WTF
-
-#define ASSERT_SIZE(className, sameSizeAsClassName) \
-  static_assert(WTF::assert_size<className, sameSizeAsClassName>::value, "");
-
-#endif  // WTF_SizeAssertions_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