[Remoting Android] Move pairing secret fetcher to the network thread

remoting/client/jni/chromoting_jni_instance.h

 // Copyright 2013 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_CHROMOTING_JNI_INSTANCE_H_
 #define REMOTING_CLIENT_CHROMOTING_JNI_INSTANCE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 118 matching lines @@
   // ClipboardStub implementation.
   void SetCursorShape(const protocol::CursorShapeInfo& shape) override;
 
   // Get the weak pointer of the instance. Please only use it on the network
   // thread.
   base::WeakPtr<ChromotingJniInstance> GetWeakPtr();
 
  private:
   void ConnectToHostOnNetworkThread();
 
-  // Notifies the user interface that the user needs to enter a PIN. The
-  // current authentication attempt is put on hold until |callback| is invoked.
-  // May be called on any thread.
-  void FetchSecret(bool pairable,
-                   const protocol::SecretFetchedCallback& callback);
-
   // Sets the device name. Can be called on any thread.
   void SetDeviceName(const std::string& device_name);
 
   void SendKeyEventInternal(int usb_key_code, bool key_down);
 
   // Enables or disables periodic logging of performance statistics. Called on
   // the network thread.
   void EnableStatsLogging(bool enabled);
 
   // If logging is enabled, logs the current connection statistics, and
@@ skipping 54 matching lines @@
   bool connected_ = false;
 
   base::WeakPtrFactory<ChromotingJniInstance> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingJniInstance);
 };
 
 }  // namespace remoting
 
 #endif