Add a mechanism to disable IPv6....

net/base/host_cache.cc

 // Copyright (c) 2009 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/base/host_cache.h"
 
 #include "base/logging.h"
 #include "net/base/net_errors.h"
 
 namespace net {
@@ skipping 11 matching lines @@
 
 //-----------------------------------------------------------------------------
 
 HostCache::HostCache(size_t max_entries, size_t cache_duration_ms)
     : max_entries_(max_entries), cache_duration_ms_(cache_duration_ms) {
 }
 
 HostCache::~HostCache() {
 }
 
-const HostCache::Entry* HostCache::Lookup(const std::string& hostname,
+const HostCache::Entry* HostCache::Lookup(const Key& key,
                                           base::TimeTicks now) const {
   if (caching_is_disabled())
     return NULL;
 
-  EntryMap::const_iterator it = entries_.find(hostname);
+  EntryMap::const_iterator it = entries_.find(key);
   if (it == entries_.end())
     return NULL;  // Not found.
 
   Entry* entry = it->second.get();
   if (CanUseEntry(entry, now))
     return entry;
 
   return NULL;
 }
 
-HostCache::Entry* HostCache::Set(const std::string& hostname,
+HostCache::Entry* HostCache::Set(const Key& key,
                                  int error,
                                  const AddressList addrlist,
                                  base::TimeTicks now) {
   if (caching_is_disabled())
     return NULL;
 
   base::TimeTicks expiration = now +
       base::TimeDelta::FromMilliseconds(cache_duration_ms_);
 
-  scoped_refptr<Entry>& entry = entries_[hostname];
+  scoped_refptr<Entry>& entry = entries_[key];
   if (!entry) {
     // Entry didn't exist, creating one now.
     Entry* ptr = new Entry(error, addrlist, expiration);
     entry = ptr;
 
     // Compact the cache if we grew it beyond limit -- exclude |entry| from
     // being pruned though!
     if (entries_.size() > max_entries_)
       Compact(now, ptr);
     return ptr;
@@ skipping 37 matching lines @@
     } else {
       ++it;
     }
   }
 
   if (entries_.size() > max_entries_)
     DLOG(WARNING) << "Still above max entries limit";
 }
 
 }  // namespace net