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diff --git a/jingle/notifier/base/weak_xmpp_client.h b/jingle/notifier/base/weak_xmpp_client.h
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+++ b/jingle/notifier/base/weak_xmpp_client.h
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+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// A thin wrapper around buzz::XmppClient that exposes weak pointers
+// so that users know when the buzz::XmppClient becomes invalid to use
+// (not necessarily only at destruction time).
+
+#ifndef JINGLE_NOTIFIER_BASE_WEAK_XMPP_CLIENT_H_
+#define JINGLE_NOTIFIER_BASE_WEAK_XMPP_CLIENT_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/non_thread_safe.h"
+#include "base/weak_ptr.h"
+#include "talk/xmpp/xmppclient.h"
+
+namespace talk_base {
+class TaskParent;
+}  // namespace
+
+namespace notifier {
+
+// buzz::XmppClient's destructor isn't marked virtual, but it inherits
+// from talk_base::Task, whose destructor *is* marked virtual, so we
+// can safely inherit from it.
+class WeakXmppClient : public buzz::XmppClient {
+ public:
+  explicit WeakXmppClient(talk_base::TaskParent* parent);
+
+  virtual ~WeakXmppClient();
+
+  // Returns a weak pointer that is invalidated when the XmppClient
+  // becomes invalid to use.
+  base::WeakPtr<WeakXmppClient> AsWeakPtr();
+
+  // Invalidates all weak pointers to this object.  (This method is
+  // necessary as calling Abort() does not always lead to Stop() being
+  // called, so it's not a reliable way to cause an invalidation.)
+  void Invalidate();
+
+ protected:
+  virtual void Stop();
+
+ private:
+  NonThreadSafe non_thread_safe_;
+  // We use our own WeakPtrFactory instead of inheriting from
+  // SupportsWeakPtr since we want to invalidate in other places
+  // besides the destructor.
+  base::WeakPtrFactory<WeakXmppClient> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WeakXmppClient);
+};
+
+}  // namespace notifier
+
+#endif  // JINGLE_NOTIFIER_BASE_WEAK_XMPP_CLIENT_H_