remove the Cesium.when

libs/s3m/S3MTiles/S3MTile.js

@@ -385,7 +385,7 @@ S3MTile.prototype.requestContent = function() {
   }
 
   this.contentState = ContentState.LOADING
-  this.contentReadyPromise = new Promise()
+  this.contentReadyPromise =  Promise
   let contentFailedFunction = getContentFailedFunction(this)
 
   promise
@@ -397,7 +397,7 @@ S3MTile.prototype.requestContent = function() {
 
       contentReadyFunction(layer, that, arrayBuffer)
     })
-    .otherwise(function(error) {
+    .catch(function(error) {
       if (request.state === Cesium.RequestState.CANCELLED) {
         that.contentState = ContentState.UNLOADED
         return

libs/s3m/S3MTiles/S3MTilesLayer.js

@@ -54,7 +54,7 @@ function S3MTilesLayer(options) {
     distance: Number.MAX_VALUE,
     pixel: Number.MAX_VALUE
   }
-  this._readyPromise = new Promise()
+  this._readyPromise = Promise
 
   this.loadConfig(options.url)
 }
@@ -205,7 +205,7 @@ S3MTilesLayer.prototype.loadConfig = function(url) {
 
       that._readyPromise.resolve(that)
     })
-    .otherwise(function(error) {
+    .catch(function(error) {
       that._readyPromise.reject(error)
     })
 }