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

components/proximity_auth/remote_device_life_cycle_impl.cc

 // 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.
 
 #include "components/proximity_auth/remote_device_life_cycle_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 44 matching lines @@
   PA_LOG(INFO) << "Life cycle for " << remote_device_.bluetooth_address
                << " started.";
   DCHECK(state_ == RemoteDeviceLifeCycle::State::STOPPED);
   FindConnection();
 }
 
 cryptauth::RemoteDevice RemoteDeviceLifeCycleImpl::GetRemoteDevice() const {
   return remote_device_;
 }
 
+cryptauth::Connection* RemoteDeviceLifeCycleImpl::GetConnection() const {
+  if (connection_)
+    return connection_.get();
+  if (messenger_)
+    return messenger_->GetConnection();
+  return nullptr;
+}
+
 RemoteDeviceLifeCycle::State RemoteDeviceLifeCycleImpl::GetState() const {
   return state_;
 }
 
 Messenger* RemoteDeviceLifeCycleImpl::GetMessenger() {
   return messenger_.get();
 }
 
 void RemoteDeviceLifeCycleImpl::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
@@ skipping 104 matching lines @@
   TransitionToState(RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
 }
 
 void RemoteDeviceLifeCycleImpl::OnDisconnected() {
   DCHECK(state_ == RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
   messenger_.reset();
   FindConnection();
 }
 
 }  // namespace proximity_auth