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diff --git a/Source/WebCore/Modules/mediastream/OverconstrainedErrorEvent.h b/Source/WebCore/Modules/mediastream/OverconstrainedErrorEvent.h
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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.
+ */
+
+#pragma once
+
+#if ENABLE(MEDIA_STREAM)
+
+#include "Event.h"
+#include "OverconstrainedError.h"
+#include <wtf/text/AtomicString.h>
+
+namespace WebCore {
+
+class OverconstrainedErrorEvent : public Event {
+public:
+    virtual ~OverconstrainedErrorEvent() { }
+
+    static Ref<OverconstrainedErrorEvent> create(const AtomicString& type, bool canBubble, bool cancelable, OverconstrainedError* error)
+    {
+        return adoptRef(*new OverconstrainedErrorEvent(type, canBubble, cancelable, error));
+    }
+
+    struct Init : EventInit {
+        RefPtr<OverconstrainedError> error;
+    };
+
+    static Ref<OverconstrainedErrorEvent> create(const AtomicString& type, const Init& initializer, IsTrusted isTrusted = IsTrusted::No)
+    {
+        return adoptRef(*new OverconstrainedErrorEvent(type, initializer, isTrusted));
+    }
+
+    OverconstrainedError* error() const { return m_error.get(); }
+    EventInterface eventInterface() const override { return OverconstrainedErrorEventInterfaceType; }
+
+private:
+    explicit OverconstrainedErrorEvent(const AtomicString& type, bool canBubble, bool cancelable, OverconstrainedError* error)
+        : Event(type, canBubble, cancelable)
+        , m_error(error)
+    {
+    }
+    OverconstrainedErrorEvent(const AtomicString& type, const Init& initializer, IsTrusted isTrusted)
+        : Event(type, initializer, isTrusted)
+        , m_error(initializer.error)
+    {
+    }
+
+    RefPtr<OverconstrainedError> m_error;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(MEDIA_STREAM)