[Media Router] Remove obsolete code and bindings.

extensions/renderer/resources/media_router_bindings.js

Index: extensions/renderer/resources/media_router_bindings.js
diff --git a/extensions/renderer/resources/media_router_bindings.js b/extensions/renderer/resources/media_router_bindings.js
index 5f0d9a0a824f59254b49332b6eb0c2b39469bccf..faf7d00325573260faaf3258cfe8ee10e37f7068 100644
--- a/extensions/renderer/resources/media_router_bindings.js
+++ b/extensions/renderer/resources/media_router_bindings.js
@@ -265,13 +265,12 @@ define('media_router_bindings', [
    * updated.
    * @param {!string} sourceUrn
    * @param {!Array<!MediaSink>} sinks
-   * @param {Array<string>=} opt_origins
+   * @param {!Array<string>} origins
    */
   MediaRouter.prototype.onSinksReceived = function(sourceUrn, sinks,
-      opt_origins) {
-    // TODO(imcheng): Make origins required in M52+.
+      origins) {
     this.service_.onSinksReceived(sourceUrn, sinks.map(sinkToMojo_),
-        opt_origins || []);
+        origins);
   };
 
   /**
@@ -357,23 +356,17 @@ define('media_router_bindings', [
    * Called by the provider manager when the set of active routes
    * has been updated.
    * @param {!Array<MediaRoute>} routes The active set of media routes.
-   * @param {string=} opt_sourceUrn The sourceUrn associated with this route
-   *     query. This parameter is optional and can be empty.
-   * @param {Array<string>=} opt_joinableRouteIds The active set of joinable
-   *     media routes. This parameter is optional and can be empty.
+   * @param {string=} sourceUrn The sourceUrn associated with this route
+   *     query.
+   * @param {Array<string>=} joinableRouteIds The active set of joinable
+   *     media routes.
    */
   MediaRouter.prototype.onRoutesUpdated =
-      function(routes, opt_sourceUrn, opt_joinableRouteIds) {
-    // TODO(boetger): This check allows backward compatibility with the Cast SDK
-    // and can be removed when the Cast SDK is updated.
-    if (typeof(opt_sourceUrn) != 'string') {
-      opt_sourceUrn = '';
-    }
-
+      function(routes, sourceUrn = '', joinableRouteIds = []) {
     this.service_.onRoutesUpdated(
         routes.map(routeToMojo_),
-        opt_sourceUrn || '',
-        opt_joinableRouteIds || []);
+        sourceUrn,
+        joinableRouteIds);
   };
 
   /**
@@ -462,13 +455,6 @@ define('media_router_bindings', [
     this.sendRouteBinaryMessage = null;
 
     /**
-     * TODO(imcheng): Remove in M55 (crbug.com/626395).
-     * @type {function(string):
-     *     Promise.<{messages: Array.<RouteMessage>, error: boolean}>}
-     */
-    this.listenForRouteMessages = null;
-
-    /**
      * @type {function(string)}
      */
     this.startListeningForRouteMessages = null;
@@ -703,20 +689,9 @@ define('media_router_bindings', [
    */
   MediaRouteProvider.prototype.terminateRoute = function(routeId) {
     this.handlers_.onBeforeInvokeHandler();
-    // TODO(crbug.com/627967): Remove code path that doesn't expect a Promise
-    // in M56.
-    var maybePromise = this.handlers_.terminateRoute(routeId);
-    var successResult = {
-        result_code: mediaRouterMojom.RouteRequestResultCode.OK
-    };
-    if (maybePromise) {
-      return maybePromise.then(
-        function() { return successResult; },
-        function(err) { return toErrorRouteResponse_(err); }
-      );
-    } else {
-      return Promise.resolve(successResult);
-    }
+    return this.handlers_.terminateRoute(routeId).then(
+        () => ({result_code: mediaRouterMojom.RouteRequestResultCode.OK}),
+        (err) => toErrorRouteResponse_(err));
   };
 
   /**
@@ -762,35 +737,7 @@ define('media_router_bindings', [
   MediaRouteProvider.prototype.startListeningForRouteMessages = function(
       routeId) {
     this.handlers_.onBeforeInvokeHandler();
-    if (this.handlers_.startListeningForRouteMessages) {
-      this.handlers_.startListeningForRouteMessages(routeId);
-    } else {
-      // Old API.
-      this.listenForRouteMessagesOld(routeId);
-    }
-  };
-
-
-  /**
-   * A hack to adapt new MR messaging API to old extension messaging API.
-   * TODO(imcheng): Remove in M55 (crbug.com/626395).
-   * @param {!string} routeId
-   */
-  MediaRouteProvider.prototype.listenForRouteMessagesOld = function(routeId) {
-    this.handlers_.onBeforeInvokeHandler();
-    this.handlers_.listenForRouteMessages(routeId)
-        .then(function(messages) {
-          // If messages is empty, then stopListeningForRouteMessages has been
-          // called. We don't need to send it back to MR.
-          if (messages.length > 0) {
-            // Send the messages back to MR, and listen for next batch of
-            // messages.
-            this.mediaRouter_.onRouteMessagesReceived(routeId, messages);
-            this.listenForRouteMessagesOld(routeId);
-          }
-        }.bind(this), function() {
-          // Ignore rejections.
-        }.bind(this));
+    this.handlers_.startListeningForRouteMessages(routeId);
   };
 
   /**