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diff --git a/Source/WebCore/bindings/objc/ExceptionHandlers.h b/Source/WebCore/bindings/objc/ExceptionHandlers.h
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+/*
+ * Copyright (C) 2004, 2005, 2006, 2007 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. 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. 
+ */
+
+#ifndef ExceptionHandlers_h
+#define ExceptionHandlers_h
+
+#include <wtf/Assertions.h>
+
+#if !defined(NDEBUG) && !defined(DISABLE_THREAD_CHECK)
+#define DOM_ASSERT_MAIN_THREAD() do \
+    if (!pthread_main_np()) { \
+        WTFReportAssertionFailure(__FILE__, __LINE__, WTF_PRETTY_FUNCTION, "DOM access on non-main thread -- you will probably crash soon!"); \
+    } \
+while (0)
+#else
+#define DOM_ASSERT_MAIN_THREAD() ((void)0)
+#endif
+
+namespace WebCore {
+    
+    typedef int ExceptionCode;
+    
+    class SelectionController;
+    class Range;
+
+    void raiseDOMException(ExceptionCode);
+
+    inline void raiseOnDOMError(ExceptionCode ec) 
+    {
+        if (ec) 
+            raiseDOMException(ec);
+    }
+
+} // namespace WebCore
+
+#endif // ExceptionHandlers_h