Only block http or https doc.written scripts.

third_party/WebKit/Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 77 matching lines @@
     if (!document.settings())
         return false;
 
     if (!document.frame())
         return false;
 
     // Only block synchronously loaded (parser blocking) scripts.
     if (defer != FetchRequest::NoDefer)
         return false;
 
+    if (!request.url().protocolIsInHTTPFamily())
+        return false;
+
     // Avoid blocking same origin scripts, as they may be used to render main
     // page content, whereas cross-origin scripts inserted via document.write
     // are likely to be third party content.
     if (request.url().host() == document.getSecurityOrigin()->domain())
         return false;
 
     // Do not block scripts if it is a page reload. This is to enable pages to
     // recover if blocking of a script is leading to a page break and the user
     // reloads the page.
     const FrameLoadType loadType = document.frame()->loader().loadType();
@@ skipping 705 matching lines @@
 }
 
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     visitor->trace(m_documentLoader);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink