minor: Remove peer_data.clear().

Author: showell

static/js/peer_data.js

@@ -2,7 +2,7 @@ const {LazySet} = require("./lazy_set");
 const people = require("./people");
 
 // This maps a stream_id to a LazySet of user_ids who are subscribed.
-let stream_subscribers;
+const stream_subscribers = new Map();
 
 function assert_number(id) {
     if (typeof id !== "number") {
@@ -29,10 +29,6 @@ function get_user_set(stream_id) {
     return subscribers;
 }
 
-export function clear() {
-    stream_subscribers = new Map();
-}
-
 export function is_subscriber_subset(stream_id1, stream_id2) {
     const sub1_set = get_user_set(stream_id1);
     const sub2_set = get_user_set(stream_id2);

static/js/stream_data.js

@@ -140,7 +140,6 @@ exports.clear_subscriptions = function () {
     // it should only be used in tests.
     stream_info = new BinaryDict((sub) => sub.subscribed);
     subs_by_stream_id = new Map();
-    peer_data.clear();
 };
 
 exports.clear_subscriptions();