Move files in wtf/ to platform/wtf/ (Part 12).

third_party/WebKit/Source/wtf/debug/CrashLogging.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_CrashLogging_h
-#define WTF_CrashLogging_h
+#include "platform/wtf/debug/CrashLogging.h"
 
-#include "base/debug/crash_logging.h"
-#include "wtf/WTFExport.h"
-
-namespace WTF {
-namespace debug {
-
-using ScopedCrashKey = base::debug::ScopedCrashKey;
-
-}  // namespace debug
-}  // namespace WTF
-
-#endif  // WTF_CrashLogging_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