[HttpCacheTransaction] Ignore vary check for WriteMetadata requests

net/http/http_cache_transaction.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_cache_transaction.h"
 
 #include "build/build_config.h"  // For OS_POSIX
 
 #if defined(OS_POSIX)
 #include <unistd.h>
@@ skipping 2183 matching lines @@
   if (rv != ERR_IO_PENDING)
     return DoLoop(rv);
   return rv;
 }
 
 ValidationType HttpCache::Transaction::RequiresValidation() {
   // TODO(darin): need to do more work here:
   //  - make sure we have a matching request method
   //  - watch out for cached responses that depend on authentication
 
-  if (response_.vary_data.is_valid() &&
+  if (!(effective_load_flags_ & LOAD_SKIP_VARY_CHECK) &&
+      response_.vary_data.is_valid() &&
       !response_.vary_data.MatchesRequest(*request_,
                                           *response_.headers.get())) {
     vary_mismatch_ = true;
     validation_cause_ = VALIDATION_CAUSE_VARY_MISMATCH;
     return VALIDATION_SYNCHRONOUS;
   }
 
   if (effective_load_flags_ & LOAD_SKIP_CACHE_VALIDATION)
     return VALIDATION_NONE;
 
@@ skipping 729 matching lines @@
     default:
       NOTREACHED();
   }
 }
 
 void HttpCache::Transaction::OnIOComplete(int result) {
   DoLoop(result);
 }
 
 }  // namespace net