Revert "Move files in wtf/ to platform/wtf/"

third_party/WebKit/Source/wtf/debug/Alias.h

Index: third_party/WebKit/Source/wtf/debug/Alias.h
diff --git a/third_party/WebKit/Source/wtf/debug/Alias.h b/third_party/WebKit/Source/wtf/debug/Alias.h
index b73683772828bd4d4a9d1ec34c90c9a2274d3607..8907924e7e64563e6d4e3d0cc0178b544f29339c 100644
--- a/third_party/WebKit/Source/wtf/debug/Alias.h
+++ b/third_party/WebKit/Source/wtf/debug/Alias.h
@@ -1,9 +1,20 @@
-// Copyright 2017 The Chromium Authors. All rights reserved.
+// Copyright 2016 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 "platform/wtf/debug/Alias.h"
+#ifndef WTF_Alias_h
+#define WTF_Alias_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
+#include "base/debug/alias.h"
+
+namespace WTF {
+namespace debug {
+
+inline void alias(const void* var) {
+  base::debug::Alias(var);
+}
+
+}  // namespace debug
+}  // namespace WTF
+
+#endif  // WTF_Alias_h