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diff --git a/Source/WebCore/Modules/mediastream/OverconstrainedErrorEvent.idl b/Source/WebCore/Modules/mediastream/OverconstrainedErrorEvent.idl
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+/*
+* Copyright (C) 2016 Apple 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:
+*
+* 1.  Redistributions of source code must retain the above copyright
+*     notice, this list of conditions and the following disclaimer.
+* 2.  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.
+* 3.  Neither the name of Apple Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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.
+*/
+
+[
+    Conditional=MEDIA_STREAM,
+    Constructor(DOMString type, optional OverconstrainedErrorEventInit eventInitDict),
+] interface OverconstrainedErrorEvent : Event {
+    readonly attribute OverconstrainedError? error;
+};
+
+dictionary OverconstrainedErrorEventInit : EventInit {
+    OverconstrainedError? error = null;
+};