Files app: fix "Buy more storage" link in the low Drive space warning

chrome/browser/resources/file_manager/js/drive_banners.js

 // Copyright (c) 2012 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.
 
 /**
  * Responsible for showing banners in the file list.
  * @param {DirectoryModel} directoryModel The model.
  * @param {VolumeManager} volumeManager The manager.
  * @param {DOMDocument} document HTML document.
  * @constructor
@@ skipping 264 matching lines @@
     var icon = this.document_.createElement('div');
     icon.className = 'gdrive-icon';
     box.appendChild(icon);
 
     var text = this.document_.createElement('div');
     text.className = 'gdrive-text';
     text.textContent = strf('DRIVE_SPACE_AVAILABLE_LONG',
         util.bytesToSi(sizeStats.remainingSizeKB * 1024));
     box.appendChild(text);
 
-    var link = this.document_.createElement('div');
+    var link = this.document_.createElement('a');
     link.className = 'plain-link';
     link.textContent = str('DRIVE_BUY_MORE_SPACE_LINK');
     link.href = GOOGLE_DRIVE_BUY_STORAGE;
+    link.target = '_blank';
     box.appendChild(link);
 
     var close = this.document_.createElement('div');
     close.className = 'cr-dialog-close';
     box.appendChild(close);
     close.addEventListener('click', function(total) {
       localStorage[WARNING_DISMISSED_KEY] = total;
       box.hidden = true;
       this.requestRelayout_(100);
     }.bind(this, sizeStats.totalSizeKB));
@@ skipping 275 matching lines @@
  *                                    this.newWelcome_ get ready.
  * @private
  */
 FileListBannerController.prototype.preparePromo_ = function(completeCallback) {
   if (this.newWelcome_ !== undefined)
     completeCallback();
   else
     (this.promoCallbacks_ = this.promoCallbacks_ || []).push(completeCallback);
 };