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

third_party/WebKit/Source/wtf/SaturatedArithmetic.h

Index: third_party/WebKit/Source/wtf/SaturatedArithmetic.h
diff --git a/third_party/WebKit/Source/wtf/SaturatedArithmetic.h b/third_party/WebKit/Source/wtf/SaturatedArithmetic.h
index 5824a06648ace5ebd20e279ea42a5bba7db58dfe..c85f291660c7d34bd350c9f5dacdc058610e6662 100644
--- a/third_party/WebKit/Source/wtf/SaturatedArithmetic.h
+++ b/third_party/WebKit/Source/wtf/SaturatedArithmetic.h
@@ -1,9 +1,48 @@
-// 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.
+/*
+ * Copyright (c) 2012, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
-#include "platform/wtf/SaturatedArithmetic.h"
+#ifndef SaturatedArithmetic_h
+#define SaturatedArithmetic_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/numerics/saturated_arithmetic.h"
+
+namespace WTF {
+using base::SaturatedAddition;
+using base::SaturatedSubtraction;
+using base::SaturatedNegative;
+using base::SaturatedSet;
+}  // namespace WTF
+
+using WTF::SaturatedAddition;
+using WTF::SaturatedSubtraction;
+using WTF::SaturatedNegative;
+using WTF::SaturatedSet;
+
+#endif  // SaturatedArithmetic_h