| Index: Source/core/loader/FrameFetchContext.cpp
 | 
| ===================================================================
 | 
| --- Source/core/loader/FrameFetchContext.cpp	(revision 199024)
 | 
| +++ Source/core/loader/FrameFetchContext.cpp	(working copy)
 | 
| @@ -584,7 +584,7 @@
 | 
|      // 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");
 | 
| +        fetchRequest.mutableResourceRequest().addHTTPHeaderField("Upgrade-Insecure-Requests", "1");
 | 
|  
 | 
|      if (m_document && m_document->insecureRequestsPolicy() == SecurityContext::InsecureRequestsUpgrade && url.protocolIs("http")) {
 | 
|          ASSERT(m_document->insecureNavigationsToUpgrade());
 | 
| 
 |