Add content-security-policy directive to print-preview pages.

chrome/browser/resources/print_preview/print_preview.js

 // Copyright (c) 2011 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.
 
 // require: cr/ui/print_preview_cloud.js
 
 var localStrings = new LocalStrings();
 
 // If useCloudPrint is true we attempt to connect to cloud print
 // and populate the list of printers with cloud print printers.
@@ skipping 948 matching lines @@
 }
 
 /**
  * Takes a snapshot of the print settings.
  */
 PrintSettings.prototype.save = function() {
   this.deviceName = getSelectedPrinterName();
   this.isLandscape = layoutSettings.isLandscape();
 }
 
+/// Pull in all other scripts in a single shot.
+<include src="print_preview_animations.js"/>
+<include src="print_preview_cloud.js"/>
+<include src="print_preview_utils.js"/>
+<include src="print_header.js"/>
+<include src="page_settings.js"/>
+<include src="copies_settings.js"/>
+<include src="layout_settings.js"/>
+<include src="color_settings.js"/>