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diff --git a/testing/gtest/benchmark/BlackBox.cpp b/testing/gtest/benchmark/BlackBox.cpp
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+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if defined(_MSC_VER)
+
+# include "gtest/BlackBox.h"
+
+namespace mozilla {
+
+char volatile* UseCharPointer(char volatile* aPtr) { return aPtr; }
+
+} // namespace mozilla
+
+#endif