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

components/proximity_auth/messenger_impl.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_IMPL_H
 #define COMPONENTS_PROXIMITY_AUTH_MESSENGER_IMPL_H
 
 #include <deque>
 #include <memory>
 
@@ skipping 26 matching lines @@
   ~MessengerImpl() override;
 
   // Messenger:
   void AddObserver(MessengerObserver* observer) override;
   void RemoveObserver(MessengerObserver* observer) override;
   bool SupportsSignIn() const override;
   void DispatchUnlockEvent() override;
   void RequestDecryption(const std::string& challenge) override;
   void RequestUnlock() override;
   cryptauth::SecureContext* GetSecureContext() const override;
+  cryptauth::Connection* GetConnection() const override;
 
   // Exposed for testing.
   cryptauth::Connection* connection() { return connection_.get(); }
 
  private:
   // Internal data structure to represent a pending message that either hasn't
   // been sent yet or is waiting for a response from the remote device.
   struct PendingMessage {
     PendingMessage();
     PendingMessage(const base::DictionaryValue& message);
@@ skipping 62 matching lines @@
   std::unique_ptr<PendingMessage> pending_message_;
 
   base::WeakPtrFactory<MessengerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MessengerImpl);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_MESSENGER_IMPL_H