[HttpCache] LOAD_ONLY_FROM_CACHE should not imply LOAD_PREFERRING_CACHE

chrome/browser/safe_browsing/threat_details_cache.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.
 //
 // Implementation of the ThreatDetails class.
 
 #include "chrome/browser/safe_browsing/threat_details.h"
 
 #include <stdint.h>
 
@@ skipping 71 matching lines @@
   }
 
   current_fetch_ = net::URLFetcher::Create(GURL(resources_it_->first),
                                            net::URLFetcher::GET, this);
   data_use_measurement::DataUseUserData::AttachToFetcher(
       current_fetch_.get(),
       data_use_measurement::DataUseUserData::SAFE_BROWSING);
   current_fetch_->SetRequestContext(request_context_getter_.get());
   // Only from cache, and don't save cookies.
   current_fetch_->SetLoadFlags(net::LOAD_ONLY_FROM_CACHE |
+                               net::LOAD_SKIP_CACHE_VALIDATION |
                                net::LOAD_DO_NOT_SAVE_COOKIES);
   current_fetch_->SetAutomaticallyRetryOn5xx(false);  // No retries.
   current_fetch_->Start();  // OnURLFetchComplete will be called when done.
 }
 
 ClientSafeBrowsingReportRequest::Resource*
 ThreatDetailsCacheCollector::GetResource(const GURL& url) {
   ResourceMap::iterator it = resources_->find(url.spec());
   if (it != resources_->end()) {
     return it->second.get();
@@ skipping 101 matching lines @@
 
 void ThreatDetailsCacheCollector::AllDone(bool success) {
   DVLOG(1) << "AllDone";
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   *result_ = success;
   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, callback_);
   callback_.Reset();
 }
 
 }  // namespace safe_browsing