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

components/proximity_auth/remote_device_life_cycle_impl.cc

Index: components/proximity_auth/remote_device_life_cycle_impl.cc
diff --git a/components/proximity_auth/remote_device_life_cycle_impl.cc b/components/proximity_auth/remote_device_life_cycle_impl.cc
index 0661088b13709e29cb4509abfc3cf395249c7810..54e4b71f1eee943b7e4e9607fb24a67d2e93634c 100644
--- a/components/proximity_auth/remote_device_life_cycle_impl.cc
+++ b/components/proximity_auth/remote_device_life_cycle_impl.cc
@@ -62,6 +62,14 @@ 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_;
 }