Add plugin stub for print preview tests

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 154 matching lines @@
      */
     this.overlayEl_ = null;
 
     /**
      * The "Open system dialog" button.
      * @type {HTMLButtonElement}
      * @private
      */
     this.openSystemDialogButton_ = null;
 
-    /**
-     * If this is in a browser test (fake plugin).
-     * @private {boolean}
-     */
-    this.isBrowserTest_ = false;
   }
 
   /**
    * Event types dispatched by the preview area.
    * @enum {string}
    */
   PreviewArea.EventType = {
     // Dispatched when the "Open system dialog" button is clicked.
     OPEN_SYSTEM_DIALOG_CLICK:
         'print_preview.PreviewArea.OPEN_SYSTEM_DIALOG_CLICK',
@@ skipping 408 matching lines @@
       this.plugin_.loadPreviewPage(event.previewUrl, event.previewIndex);
     },
 
     /**
      * Called when the preview generation is complete and the document is ready
      * to print.
      * @private
      */
     onDocumentReady_: function(event) {
       this.isDocumentReady_ = true;
-      if (this.isBrowserTest_)
-        this.isPluginReloaded_ = true;
       this.dispatchPreviewGenerationDoneIfReady_();
     },
 
     /**
      * Cancels the timeout so that an error message can be shown.
      */
     cancelTimeout: function() {
       if (this.loadingTimeout_) {
         clearTimeout(this.loadingTimeout_);
         this.loadingTimeout_ = null;
@@ skipping 48 matching lines @@
     onMarginDragChanged_: function(isDragging) {
       if (!this.plugin_)
         return;
 
       // When hovering over the plugin (which may be in a separate iframe)
       // 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';
     },
-
-    /** @param {boolean} isTest Whether this instance is in a browser test. */
-    setIsBrowserTest: function(isTest) {
-      this.isBrowserTest_ = isTest;
-    }
   };
 
   // Export
   return {PreviewArea: PreviewArea};
 });