Remove outdated comment on GmsRpc (#6442)

The comment have been outdated since 2021

NO_RELEASE_CHANGE

Author: rlazo

firebase-messaging/src/main/java/com/google/firebase/messaging/GmsRpc.java

@@ -77,12 +77,9 @@ class GmsRpc {
   private static final String EXTRA_TOPIC = "gcm.topic";
   private static final String TOPIC_PREFIX = "/topics/";
 
-  // LINT.IfChange
   /** InstanceId should be reset. Can be a duplicate, or deleted. */
   static final String ERROR_INSTANCE_ID_RESET = "INSTANCE_ID_RESET";
 
-  // LINT.ThenChange(//depot/google3/firebase/instance_id/client/cpp/src/android/instance_id.cc)
-
   // --- List of parameters sent to the /register3 servlet
 
   /** Internal parameter used to indicate a 'subtype'. Will not be stored in DB for Nacho. */