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diff --git a/Source/WebCore/notifications/NotificationCenter.cpp b/Source/WebCore/notifications/NotificationCenter.cpp
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+++ b/Source/WebCore/notifications/NotificationCenter.cpp
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+/*
+ * Copyright (C) 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"
+
+#if ENABLE(NOTIFICATIONS)
+
+#include "NotificationCenter.h"
+
+#include "Document.h"
+#include "VoidCallback.h"
+#include "WorkerContext.h"
+
+namespace WebCore {
+
+NotificationCenter::NotificationCenter(ScriptExecutionContext* context, NotificationPresenter* presenter)
+    : ActiveDOMObject(context, this)
+    , m_scriptExecutionContext(context)
+    , m_notificationPresenter(presenter) {}
+
+int NotificationCenter::checkPermission()
+{
+    if (!presenter())
+        return NotificationPresenter::PermissionDenied;
+    return m_notificationPresenter->checkPermission(m_scriptExecutionContext);
+}
+
+void NotificationCenter::requestPermission(PassRefPtr<VoidCallback> callback)
+{
+    if (!presenter())
+        return;
+    m_notificationPresenter->requestPermission(m_scriptExecutionContext, callback);
+}
+
+void NotificationCenter::disconnectFrame()
+{
+    // m_notificationPresenter should never be 0. But just to be safe, we check it here.
+    // Due to the mysterious bug http://code.google.com/p/chromium/issues/detail?id=49323.
+    ASSERT(m_notificationPresenter);
+    if (!m_notificationPresenter)
+        return;
+    m_notificationPresenter->cancelRequestsForPermission(m_scriptExecutionContext);
+    m_notificationPresenter = 0;
+    m_scriptExecutionContext = 0;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(NOTIFICATIONS)