Print Preview: Finish removing global Javascript functions.

chrome/browser/resources/print_preview/previewarea/preview_area.js

Index: chrome/browser/resources/print_preview/previewarea/preview_area.js
diff --git a/chrome/browser/resources/print_preview/previewarea/preview_area.js b/chrome/browser/resources/print_preview/previewarea/preview_area.js
index 0e2ff3cddd471ad28cf4df0ad862347328a036a9..670fcc3160f2f0bdcb55dd692aedf94780eb0ccf 100644
--- a/chrome/browser/resources/print_preview/previewarea/preview_area.js
+++ b/chrome/browser/resources/print_preview/previewarea/preview_area.js
@@ -357,6 +357,7 @@ cr.define('print_preview', function() {
             this.previewGenerator_,
             print_preview.PreviewGenerator.EventType.DOCUMENT_READY,
             this.onDocumentReady_.bind(this));
+        this.previewGenerator_.addWebUIEventListeners(this.listenerTracker);
       } else {
         this.showCustomMessage(loadTimeData.getString('noPlugin'));
       }
@@ -365,9 +366,6 @@ cr.define('print_preview', function() {
     /** @override */
     exitDocument: function() {
       print_preview.Component.prototype.exitDocument.call(this);
-      if (this.previewGenerator_) {
-        this.previewGenerator_.removeEventListeners();
-      }
       this.overlayEl_ = null;
       this.openSystemDialogButton_ = null;
     },