Fix missing comma in HeadersToIgnore array.

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 42 matching lines @@
 
 // These response headers are not copied from a revalidated response to the
 // cached response headers. For compatibility, this list is based on Chromium's
 // net/http/http_response_headers.cc.
 const char* const headersToIgnoreAfterRevalidation[] = {
     "allow",
     "connection",
     "etag",
     "expires",
     "keep-alive",
-    "last-modified"
+    "last-modified",
     "proxy-authenticate",
     "proxy-connection",
     "trailer",
     "transfer-encoding",
     "upgrade",
     "www-authenticate",
     "x-frame-options",
     "x-xss-protection",
 };
 
@@ skipping 1013 matching lines @@
     case Resource::Media:
         return "Media";
     case Resource::Manifest:
         return "Manifest";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 
 } // namespace blink