[Remoting Android] Fix GetWeakPtr() calls on multiple threads

remoting/client/jni/jni_client.h

 // Copyright 2015 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.
 
 #ifndef REMOTING_CLIENT_JNI_JNI_CLIENT_H_
 #define REMOTING_CLIENT_JNI_JNI_CLIENT_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 148 matching lines @@
 
   std::unique_ptr<DisplayUpdaterFactory> display_handler_;
 
   // Deleted on UI thread.
   std::unique_ptr<JniPairingSecretFetcher> secret_fetcher_;
 
   // Deleted on Network thread.
   std::unique_ptr<ChromotingJniInstance> session_;
 
   // Holds pointer for the UI thread.
+  base::WeakPtr<JniClient> weak_ptr_;
   base::WeakPtrFactory<JniClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JniClient);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_JNI_JNI_CLIENT_H_