[EasyUnlock] Update ProximityMonitor to only check for RSSI proximity.

components/proximity_auth/messenger.h

 // Copyright 2014 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 COMPONENTS_PROXIMITY_AUTH_MESSENGER_H
 #define COMPONENTS_PROXIMITY_AUTH_MESSENGER_H
 
 namespace cryptauth {
 class SecureContext;
 }
@@ skipping 24 matching lines @@
   // TODO(isherman): Add params for the RSA private key and crypto delegate.
   virtual void RequestDecryption(const std::string& challenge) = 0;
 
   // Sends a simple request to the remote device to unlock the screen.
   // OnUnlockResponse is called for each observer when the response is returned.
   virtual void RequestUnlock() = 0;
 
   // Returns the SecureContext instance used by the messenger. Ownership of the
   // SecureContext is not passed.
   virtual cryptauth::SecureContext* GetSecureContext() const = 0;
+
+  // Returns the underlying raw connection. Note that you should use
+  // |GetSecureContext()| instead if you want to send and receive messages
+  // securely.
+  virtual cryptauth::Connection* GetConnection() const = 0;
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_MESSENGER_H