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diff --git a/WebKit/mac/WebView/WebSerializedJSValue.mm b/WebKit/mac/WebView/WebSerializedJSValue.mm
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+++ b/WebKit/mac/WebView/WebSerializedJSValue.mm
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+/*
+ * Copyright (C) 2009 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 INC. 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 INC. 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.
+ */
+
+#import "WebSerializedJSValue.h"
+
+#import <WebCore/SerializedScriptValue.h>
+#import <wtf/RefPtr.h>
+
+using namespace WebCore;
+
+@interface WebSerializedJSValuePrivate : NSObject {
+@public
+    RefPtr<SerializedScriptValue> value;
+}
+@end
+
+@implementation WebSerializedJSValuePrivate
+@end
+
+@implementation WebSerializedJSValue
+
+- (id)initWithValue:(JSValueRef)value context:(JSContextRef)sourceContext exception:(JSValueRef*)exception;
+{
+    ASSERT_ARG(value, value);
+    ASSERT_ARG(sourceContext, sourceContext);
+
+    if (!value || !sourceContext) {
+        [self release];
+        return nil;
+    }
+
+    self = [super init];
+    if (!self)
+        return nil;
+
+    _private = [[WebSerializedJSValuePrivate alloc] init];
+    
+    _private->value = SerializedScriptValue::create(sourceContext, value, exception);
+    if (!_private->value) {
+        [self release];
+        return nil;
+    }
+
+    return self;
+}
+
+- (JSValueRef)deserialize:(JSContextRef)destinationContext
+{
+    if (!_private || !_private->value)
+        return 0;    
+    return _private->value->deserialize(destinationContext, 0);
+}
+
+- (void)dealloc
+{
+    [_private release];
+    _private = nil;
+    [super dealloc];
+}
+
+@end
+