Correctly send the 'HTTPS' header for top-level navigations.

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 562 matching lines @@
     return m_document ? m_document->securityOrigin() : nullptr;
 }
 
 String FrameFetchContext::charset() const
 {
     return m_document ? m_document->charset().string() : String();
 }
 
 void FrameFetchContext::upgradeInsecureRequest(FetchRequest& fetchRequest)
 {
-    if (!m_document)
-        return;
-
     KURL url = fetchRequest.resourceRequest().url();
 
     // Tack an 'HTTPS' header to outgoing navigational requests, as described in
     // https://w3c.github.io/webappsec/specs/upgrade/#feature-detect
     if (fetchRequest.resourceRequest().frameType() != WebURLRequest::FrameTypeNone)
         fetchRequest.mutableResourceRequest().addHTTPHeaderField("HTTPS", "1");
 
-    if (m_document->insecureRequestsPolicy() == SecurityContext::InsecureRequestsUpgrade && url.protocolIs("http")) {
+    if (m_document && m_document->insecureRequestsPolicy() == SecurityContext::InsecureRequestsUpgrade && url.protocolIs("http")) {
         ASSERT(m_document->insecureNavigationsToUpgrade());
 
         // We always upgrade requests that meet any of the following criteria:
         //
         // 1. Are for subresources (including nested frames).
         // 2. Are form submissions.
         // 3. Whose hosts are contained in the document's InsecureNavigationSet.
         const ResourceRequest& request = fetchRequest.resourceRequest();
         if (request.frameType() == WebURLRequest::FrameTypeNone
             || request.frameType() == WebURLRequest::FrameTypeNested
@@ skipping 37 matching lines @@
         fetchRequest.mutableResourceRequest().addHTTPHeaderField("CSP", "active");
 }
 
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink