A brief test of whether we can safely disable ipv6. Will rollback asap....

chrome/browser/io_thread.cc

 // Copyright (c) 2010 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 "chrome/browser/io_thread.h"
 #include "base/command_line.h"
 #include "base/leak_tracker.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_thread.h"
@@ skipping 18 matching lines @@
   // The FixedHostResolver allows us to send all network requests through
   // a designated test server.
   if (command_line.HasSwitch(switches::kFixedHost)) {
     std::string host =
         command_line.GetSwitchValueASCII(switches::kFixedHost);
     global_host_resolver = new net::FixedHostResolver(host);
   } else {
     global_host_resolver =
         net::CreateSystemHostResolver(network_change_notifier);
 
-    if (command_line.HasSwitch(switches::kDisableIPv6))
+//    if (command_line.HasSwitch(switches::kDisableIPv6))
       global_host_resolver->SetDefaultAddressFamily(net::ADDRESS_FAMILY_IPV4);
   }
 
   return global_host_resolver;
 }
 
 }  // namespace
 
 // The IOThread object must outlive any tasks posted to the IO thread before the
 // Quit task.
@@ skipping 134 matching lines @@
 
   // Clear the host cache to avoid showing entries from the OTR session
   // in about:net-internals.
   if (globals_->host_resolver->IsHostResolverImpl()) {
     net::HostCache* host_cache = static_cast<net::HostResolverImpl*>(
         globals_->host_resolver.get())->cache();
     if (host_cache)
       host_cache->clear();
   }
 }