Don't ignore Accept: header for cache/XHR dedupe purposes

Source/core/fetch/RawResource.cpp

 /*
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 113 matching lines @@
 {
     m_options.dataBufferingPolicy = dataBufferingPolicy;
     clear();
 }
 
 static bool shouldIgnoreHeaderForCacheReuse(AtomicString headerName)
 {
     // FIXME: This list of headers that don't affect cache policy almost certainly isn't complete.
     DEFINE_STATIC_LOCAL(HashSet<AtomicString>, m_headers, ());
     if (m_headers.isEmpty()) {
-        m_headers.add("Accept");
         m_headers.add("Cache-Control");
         m_headers.add("If-Modified-Since");
         m_headers.add("If-None-Match");
         m_headers.add("Origin");
         m_headers.add("Pragma");
         m_headers.add("Purpose");
         m_headers.add("Referer");
         m_headers.add("User-Agent");
     }
     return m_headers.contains(headerName);
@@ skipping 42 matching lines @@
     return true;
 }
 
 void RawResource::clear()
 {
     m_data.clear();
     setEncodedSize(0);
 }
 
 } // namespace WebCore