fix _downloadJsonData undefined error

disable-sponsored-tiles.patch

@@ -31,25 +31,18 @@
      return "en-US";
    },
  
-@@ -283,13 +259,6 @@ var DirectoryLinksProvider = {
+@@ -288,7 +264,6 @@ var DirectoryLinksProvider = {
-   },
+     uri = uri.replace("%CHANNEL%", UpdateUtils.UpdateChannel);
  
-   _fetchAndCacheLinks: function DirectoryLinksProvider_fetchAndCacheLinks(uri) {
+     return this._downloadJsonData(uri).then(json => {
--    // Replace with the same display locale used for selecting links data
--    uri = uri.replace("%LOCALE%", this.locale);
--    uri = uri.replace("%CHANNEL%", UpdateUtils.UpdateChannel);
--
--    return this._downloadJsonData(uri).then(json => {
 -      return OS.File.writeAtomic(this._directoryFilePath, json, {tmpPath: this._directoryFilePath + ".tmp"});
--    });
+     });
    },
  
-   /**
+@@ -299,31 +274,6 @@ var DirectoryLinksProvider = {
-@@ -298,33 +267,6 @@ var DirectoryLinksProvider = {
-    * @return promise resolved to json string, "{}" returned if status != 200
     */
    _downloadJsonData: function DirectoryLinksProvider__downloadJsonData(uri) {
--    let deferred = Promise.defer();
+     let deferred = Promise.defer();
 -    let xmlHttp = this._newXHR();
 -
 -    xmlHttp.onload = function(aResponse) {
@@ -75,19 +68,13 @@
 -      deferred.reject("Error fetching " + uri);
 -      Cu.reportError(e);
 -    }
--    return deferred.promise;
+     return deferred.promise;
    },
  
-   /**
+@@ -337,23 +287,6 @@ var DirectoryLinksProvider = {
-@@ -332,30 +274,6 @@ var DirectoryLinksProvider = {
+       return this._downloadDeferred.promise;
-    * @return promise resolved immediately if no download needed, or upon completion
+     }
-    */
+ 
-   _fetchAndCacheLinksIfNecessary: function DirectoryLinksProvider_fetchAndCacheLinksIfNecessary(forceDownload=false) {
--    if (this._downloadDeferred) {
--      // fetching links already - just return the promise
--      return this._downloadDeferred.promise;
--    }
--
 -    if (forceDownload || this._needsDownload) {
 -      this._downloadDeferred = Promise.defer();
 -      this._fetchAndCacheLinks(this._linksURL).then(() => {
@@ -105,8 +92,17 @@
 -      return this._downloadDeferred.promise;
 -    }
 -
--    // download is not needed
+     // download is not needed
--    return Promise.resolve();
+     return Promise.resolve();
+   },
+@@ -362,10 +295,6 @@ var DirectoryLinksProvider = {
+    * @return true if download is needed, false otherwise
+    */
+   get _needsDownload () {
+-    // fail if last download occured less then 24 hours ago
+-    if ((Date.now() - this._lastDownloadMS) > this._downloadIntervalMS) {
+-      return true;
+-    }
+     return false;
    },
  
-   /**