Add missing private annotations

Caught by a newer compiler/linter that we have not been able to fully
adopt yet.

Change-Id: If25c7132f33d5544533542283c42a5ac7f39a552

lib/media/adaptation_set.js

@@ -38,9 +38,9 @@ shaka.media.AdaptationSet = class {
    *    adaptation set.
    */
   constructor(root, candidates) {
-    /** @type {shaka.extern.Variant} */
+    /** @private {shaka.extern.Variant} */
     this.root_ = root;
-    /** @type {!Set.<shaka.extern.Variant>} */
+    /** @private {!Set.<shaka.extern.Variant>} */
     this.variants_ = new Set([root]);
 
     // Try to add all the candidates. If they cannot be added (because they

lib/media/adaptation_set_criteria.js

@@ -158,6 +158,7 @@ shaka.media.PreferenceBasedCriteria = class {
    * @param {!Array.<shaka.extern.Variant>} variants
    * @param {string} preferredLanguage
    * @return {!Array.<shaka.extern.Variant>}
+   * @private
    */
   static filterByLanguage_(variants, preferredLanguage) {
     const LanguageUtils = shaka.util.LanguageUtils;

lib/media/drm_engine.js

@@ -1631,6 +1631,7 @@ shaka.media.DrmEngine.prototype.pollExpiration_ = function() {
 
 /**
  * @return {boolean}
+ * @private
  */
 shaka.media.DrmEngine.prototype.areAllSessionsLoaded_ = function() {
   const metadatas = this.activeSessions_.values();

lib/offline/session_deleter.js

@@ -55,6 +55,7 @@ shaka.offline.SessionDeleter = class {
    * @param {!shaka.net.NetworkingEngine} netEngine
    * @param {shaka.offline.SessionDeleter.Bucket_} bucket
    * @return {!Promise.<!Array.<string>>} The sessions that were deleted
+   * @private
    */
   static async doDelete_(config, netEngine, bucket) {
     /** @type {!shaka.media.DrmEngine} */

lib/offline/storage.js

@@ -379,6 +379,7 @@ shaka.offline.Storage.prototype.store_ = async function(
  *
  * @param {shaka.extern.Manifest} manifest
  * @param {!shaka.media.DrmEngine} drmEngine
+ * @private
  */
 shaka.offline.Storage.prototype.filterManifest_ = function(
     manifest, drmEngine) {
@@ -617,6 +618,7 @@ shaka.offline.Storage.prototype.removeEmeSessions = function() {
 
 /**
  * @return {!Promise.<boolean>}
+ * @private
  */
 shaka.offline.Storage.prototype.removeEmeSessions_ = function() {
   this.requireSupport_();