Remove rejected promise of PiexLoader which is not caught.

ui/file_manager/image_loader/request.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @typedef {{
  *   cache: (boolean|undefined),
  *   priority: (number|undefined),
  *   taskId: number,
  *   timestamp: (number|undefined),
@@ skipping 243 matching lines @@
         metrics.Categories.INTERNALS,
         metrics.timing.Variables.EXTRACT_THUMBNAIL_FROM_RAW,
         fileType.subtype);
     this.piexLoader_.load(this.request_.url).then(function(data) {
       timer.send();
       var blob = new Blob([data.thumbnail], {type: 'image/jpeg'});
       var url = URL.createObjectURL(blob);
       this.image_.src = url;
       this.request_.orientation = data.orientation;
       this.request_.colorSpace = data.colorSpace;
-    }.bind(this), function(error) {
-      console.error('PiexLoaderError: ', error);
+    }.bind(this), function() {
+      // The error has already been logged in PiexLoader.
       onFailure();
     });
     return;
   }
 
   // Load video thumbnails by using video tag instead of XHR.
   if (fileType.type === 'video') {
     this.createVideoThumbnailUrl_(this.request_.url).then(function(url) {
       this.image_.src = url;
     }.bind(this)).catch(function(error) {
@@ skipping 306 matching lines @@
   this.image_.src = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAA' +
       'ABAAEAAAICTAEAOw==';
 
   this.xhr_.onload = function() {};
   this.xhr_.abort();
 
   // Dispose memory allocated by Canvas.
   this.canvas_.width = 0;
   this.canvas_.height = 0;
 };