Adds a feature to MHTML serialization that omits subframes and subresources marked no-store.

third_party/WebKit/Source/core/fetch/Resource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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
@@ skipping 928 matching lines @@
 {
     for (auto& redirect : m_redirectChain) {
         if (!canUseResponse(redirect.m_redirectResponse, m_responseTimestamp))
             return false;
         if (redirect.m_request.cacheControlContainsNoCache() || redirect.m_request.cacheControlContainsNoStore())
             return false;
     }
     return true;
 }
 
-bool Resource::hasCacheControlNoStoreHeader()
+bool Resource::hasCacheControlNoStoreHeader() const
 {
     return m_response.cacheControlContainsNoStore() || m_resourceRequest.cacheControlContainsNoStore();
 }
 
 bool Resource::hasVaryHeader() const
 {
     return !m_response.httpHeaderField(HTTPNames::Vary).isNull();
 }
 
 bool Resource::mustRevalidateDueToCacheHeaders()
@@ skipping 170 matching lines @@
     case Resource::Media:
         return "Media";
     case Resource::Manifest:
         return "Manifest";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 
 } // namespace blink