Add GetExpirationTimes() to HttpResponseHeader.

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"
 
 #if defined(OS_POSIX)
 #include <unistd.h>
@@ skipping 1977 matching lines @@
 
   if (effective_load_flags_ & LOAD_PREFERRING_CACHE)
     return false;
 
   if (effective_load_flags_ & LOAD_VALIDATE_CACHE)
     return true;
 
   if (request_->method == "PUT" || request_->method == "DELETE")
     return true;
 
-  if (response_.headers->RequiresValidation(
-          response_.request_time, response_.response_time, Time::Now())) {
+  const Time freshness_expiry =
+      response_.headers->GetFreshnessExpiry(response_.request_time,
+                                            response_.response_time);
+  if (freshness_expiry >= Time::Now())
     return true;
-  }
 
   return false;
 }
 
 bool HttpCache::Transaction::ConditionalizeRequest() {
   DCHECK(response_.headers.get());
 
   if (request_->method == "PUT" || request_->method == "DELETE")
     return false;
 
@@ skipping 505 matching lines @@
     default:
       NOTREACHED();
   }
 }
 
 void HttpCache::Transaction::OnIOComplete(int result) {
   DoLoop(result);
 }
 
 }  // namespace net