Apply 'x-content-type-options' check to dynamically inserted script.

Source/core/dom/ScriptLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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
@@ skipping 290 matching lines @@
     if (!contextDocument)
         return;
 
     LocalFrame* frame = contextDocument->frame();
 
     bool shouldBypassMainWorldContentSecurityPolicy = (frame && frame->script().shouldBypassMainWorldContentSecurityPolicy()) || elementDocument->contentSecurityPolicy()->allowScriptNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr)) || elementDocument->contentSecurityPolicy()->allowScriptHash(sourceCode.source());
 
     if (!m_isExternalScript && (!shouldBypassMainWorldContentSecurityPolicy && !elementDocument->contentSecurityPolicy()->allowInlineScript(elementDocument->url(), m_startLineNumber)))
         return;
 
-    if (m_isExternalScript && m_resource && !m_resource->mimeTypeAllowedByNosniff()) {
-        contextDocument->addConsoleMessage(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + m_resource->url().elidedString() + "' because its MIME type ('" + m_resource->mimeType() + "') is not executable, and strict MIME type checking is enabled.");
-        return;
+    if (m_isExternalScript) {
+        ScriptResource* resource = m_resource ? m_resource.get() : sourceCode.resource();
+        if (resource && !resource->mimeTypeAllowedByNosniff()) {
+            contextDocument->addConsoleMessage(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + resource->url().elidedString() + "' because its MIME type ('" + resource->mimeType() + "') is not executable, and strict MIME type checking is enabled.");
+            return;
+        }
     }
 
     if (frame) {
         const bool isImportedScript = contextDocument != elementDocument;
         // http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block step 2.3
         // with additional support for HTML imports.
         IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(m_isExternalScript || isImportedScript ? contextDocument.get() : 0);
 
         if (isHTMLScriptLoader(m_element))
             contextDocument->pushCurrentScript(toHTMLScriptElement(m_element));
@@ skipping 108 matching lines @@
     if (isHTMLScriptLoader(element))
         return toHTMLScriptElement(element)->loader();
 
     if (isSVGScriptLoader(element))
         return toSVGScriptElement(element)->loader();
 
     return 0;
 }
 
 }