Print Preview: Finish removing global Javascript functions.

chrome/browser/resources/print_preview/previewarea/preview_area.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.exportPath('print_preview');
 
 /**
  * Enumeration of IDs shown in the preview area.
  * @enum {string}
  * @private
@@ skipping 339 matching lines @@
             print_preview.PreviewGenerator.EventType.PREVIEW_START,
             this.onPreviewStart_.bind(this));
         this.tracker.add(
             this.previewGenerator_,
             print_preview.PreviewGenerator.EventType.PAGE_READY,
             this.onPagePreviewReady_.bind(this));
         this.tracker.add(
             this.previewGenerator_,
             print_preview.PreviewGenerator.EventType.DOCUMENT_READY,
             this.onDocumentReady_.bind(this));
+        this.previewGenerator_.addWebUIEventListeners(this.listenerTracker);
       } else {
         this.showCustomMessage(loadTimeData.getString('noPlugin'));
       }
     },
 
     /** @override */
     exitDocument: function() {
       print_preview.Component.prototype.exitDocument.call(this);
-      if (this.previewGenerator_) {
-        this.previewGenerator_.removeEventListeners();
-      }
       this.overlayEl_ = null;
       this.openSystemDialogButton_ = null;
     },
 
     /** @override */
     decorateInternal: function() {
       this.marginControlContainer_.decorate(this.getElement());
       this.overlayEl_ = this.getElement().getElementsByClassName(
           PreviewArea.Classes_.OVERLAY)[0];
       this.openSystemDialogButton_ = this.getElement().getElementsByClassName(
@@ skipping 285 matching lines @@
       // pointer events will be sent to the frame. When dragging the margins,
       // we don't want this to happen as it can cause the margin to stop
       // being draggable.
       this.plugin_.style.pointerEvents = isDragging ? 'none' : 'auto';
     },
   };
 
   // Export
   return {PreviewArea: PreviewArea};
 });