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diff --git a/webkit/port/bindings/v8/V8XMLHttpRequestUtilities.cpp b/webkit/port/bindings/v8/V8XMLHttpRequestUtilities.cpp
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+++ b/webkit/port/bindings/v8/V8XMLHttpRequestUtilities.cpp
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+/*
+ * Copyright (C) 2008, 2009 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#include "config.h"
+#include "V8XMLHttpRequestUtilities.h"
+
+#include <v8.h>
+
+#include "V8CustomBinding.h"
+#include "V8Proxy.h"
+
+#include <wtf/Assertions.h>
+
+namespace WebCore {
+
+// Use an array to hold dependents. It works like a ref-counted scheme.
+// A value can be added more than once to the xmlHttpRequest object.
+void createHiddenXHRDependency(v8::Local<v8::Object> xmlHttpRequest, v8::Local<v8::Value> value)
+{
+    ASSERT(V8Proxy::GetDOMWrapperType(xmlHttpRequest) == V8ClassIndex::XMLHTTPREQUEST || V8Proxy::GetDOMWrapperType(xmlHttpRequest) == V8ClassIndex::XMLHTTPREQUESTUPLOAD);
+    v8::Local<v8::Value> cache = xmlHttpRequest->GetInternalField(V8Custom::kXMLHttpRequestCacheIndex);
+    if (cache->IsNull() || cache->IsUndefined()) {
+        cache = v8::Array::New();
+        xmlHttpRequest->SetInternalField(V8Custom::kXMLHttpRequestCacheIndex, cache);
+    }
+
+    v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
+    cacheArray->Set(v8::Integer::New(cacheArray->Length()), value);
+}
+
+void removeHiddenXHRDependency(v8::Local<v8::Object> xmlHttpRequest, v8::Local<v8::Value> value)
+{
+    ASSERT(V8Proxy::GetDOMWrapperType(xmlHttpRequest) == V8ClassIndex::XMLHTTPREQUEST || V8Proxy::GetDOMWrapperType(xmlHttpRequest) == V8ClassIndex::XMLHTTPREQUESTUPLOAD);
+    v8::Local<v8::Value> cache = xmlHttpRequest->GetInternalField(V8Custom::kXMLHttpRequestCacheIndex);
+    ASSERT(cache->IsArray());
+    v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
+    for (int i = cacheArray->Length() - 1; i >= 0; --i) {
+        v8::Local<v8::Value> cached = cacheArray->Get(v8::Integer::New(i));
+        if (cached->StrictEquals(value)) {
+            cacheArray->Delete(i);
+            return;
+        }
+    }
+
+    // We should only get here if we try to remove an event listener that was never added.
+    ASSERT_NOT_REACHED();
+}
+
+} // namespace WebCore