Print Preview: Use cr.sendWithPromise for getInitialSettings

chrome/browser/resources/print_preview/preview_generator.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Interface to the Chromium print preview generator.
    * @param {!print_preview.DestinationStore} destinationStore Used to get the
@@ skipping 206 matching lines @@
     /** Removes all event listeners that the preview generator has attached. */
     removeEventListeners: function() {
       this.tracker_.removeAll();
     },
 
     /**
      * Adds event listeners to the relevant native layer events.
      * @private
      */
     addEventListeners_: function() {
+      var nativeLayerEventTarget = this.nativeLayer_.getEventTarget();
       this.tracker_.add(
-          this.nativeLayer_,
+          nativeLayerEventTarget,
           print_preview.NativeLayer.EventType.PAGE_LAYOUT_READY,
           this.onPageLayoutReady_.bind(this));
       this.tracker_.add(
-          this.nativeLayer_,
+          nativeLayerEventTarget,
           print_preview.NativeLayer.EventType.PAGE_COUNT_READY,
           this.onPageCountReady_.bind(this));
       this.tracker_.add(
-          this.nativeLayer_,
+          nativeLayerEventTarget,
           print_preview.NativeLayer.EventType.PAGE_PREVIEW_READY,
           this.onPagePreviewReady_.bind(this));
       this.tracker_.add(
-          this.nativeLayer_,
+          nativeLayerEventTarget,
           print_preview.NativeLayer.EventType.PREVIEW_GENERATION_DONE,
           this.onPreviewGenerationDone_.bind(this));
       this.tracker_.add(
-          this.nativeLayer_,
+          nativeLayerEventTarget,
           print_preview.NativeLayer.EventType.PREVIEW_GENERATION_FAIL,
           this.onPreviewGenerationFail_.bind(this));
     },
 
     /**
      * Dispatches a PAGE_READY event to signal that a page preview is ready.
      * @param {number} previewIndex Index of the page with respect to the pages
      *     shown in the preview. E.g an index of 0 is the first displayed page,
      *     but not necessarily the first original document page.
      * @param {number} pageNumber Number of the page with respect to the
@@ skipping 170 matching lines @@
       // current one.
       cr.dispatchSimpleEvent(this, PreviewGenerator.EventType.FAIL);
     }
   };
 
   // Export
   return {
     PreviewGenerator: PreviewGenerator
   };
 });