Experiment with hiding <script>'s 'nonce' content attribute.

third_party/WebKit/Source/core/html/HTMLScriptElement.idl

 /*
  * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 19 matching lines @@
 
     // obsolete members
     // https://html.spec.whatwg.org/#HTMLScriptElement-partial
     // TODO(foolip): The event and htmlFor attributes should return the empty
     // string on getting, and do nothing on setting.
     [CEReactions, Reflect] attribute DOMString event;
     [CEReactions, Reflect=for] attribute DOMString htmlFor;
 
     // Content Security Policy
     // https://w3c.github.io/webappsec/specs/content-security-policy/#script-src-the-nonce-attribute
-    [CEReactions, Reflect, RuntimeEnabled=ExperimentalContentSecurityPolicyFeatures] attribute DOMString nonce;
+    [CEReactions, RuntimeEnabled=ExperimentalContentSecurityPolicyFeatures] attribute DOMString nonce;
 
     // Subresource Integrity
     // https://w3c.github.io/webappsec-subresource-integrity/#HTMLScriptElement
     [Reflect] attribute DOMString integrity;
 };