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

components/proximity_auth/messenger_impl.cc

Index: components/proximity_auth/messenger_impl.cc
diff --git a/components/proximity_auth/messenger_impl.cc b/components/proximity_auth/messenger_impl.cc
index 1ffa646bda793c1aa45ab4012aedcf2899c3d58b..da2c6022ddfb7ae8ba63fb2318087ee846b7a437 100644
--- a/components/proximity_auth/messenger_impl.cc
+++ b/components/proximity_auth/messenger_impl.cc
@@ -154,6 +154,10 @@ cryptauth::SecureContext* MessengerImpl::GetSecureContext() const {
   return secure_context_.get();
 }
 
+cryptauth::Connection* MessengerImpl::GetConnection() const {
+  return connection_.get();
+}
+
 MessengerImpl::PendingMessage::PendingMessage() {}
 
 MessengerImpl::PendingMessage::PendingMessage(