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diff --git a/chromium/third_party/webrtc/base/maccocoathreadhelper.h b/chromium/third_party/webrtc/base/maccocoathreadhelper.h
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+/*
+ * Copyright 2008 The WebRTC Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Helper function for using Cocoa with Posix threads. This header should be
+// included from C/C++ files that want to use some Cocoa functionality without
+// using the .mm extension (mostly for files that are compiled on multiple
+// platforms).
+
+#ifndef WEBRTC_BASE_MACCOCOATHREADHELPER_H__
+#define WEBRTC_BASE_MACCOCOATHREADHELPER_H__
+
+namespace rtc {
+
+// Cocoa must be "put into multithreading mode" before Cocoa functionality can
+// be used on POSIX threads. This function does that.
+void InitCocoaMultiThreading();
+
+} // namespace rtc
+
+#endif // WEBRTC_BASE_MACCOCOATHREADHELPER_H__