Fixed a few data races on reference counters.

net/base/host_resolver.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef NET_BASE_HOST_RESOLVER_H_
 #define NET_BASE_HOST_RESOLVER_H_
 
 #include <string>
 
 #include "base/ref_counted.h"
@@ skipping 10 matching lines @@
 
 // This class represents the task of resolving hostnames (or IP address
 // literal) to an AddressList object.
 //
 // HostResolver can handle multiple requests at a time, so when cancelling a
 // request the RequestHandle that was returned by Resolve() needs to be
 // given.  A simpler alternative for consumers that only have 1 outstanding
 // request at a time is to create a SingleRequestHostResolver wrapper around
 // HostResolver (which will automatically cancel the single request when it
 // goes out of scope).
-class HostResolver : public base::RefCounted<HostResolver> {
+class HostResolver : public base::RefCountedThreadSafe<HostResolver> {
  public:
   // The parameters for doing a Resolve(). |hostname| and |port| are required,
   // the rest are optional (and have reasonable defaults).
   class RequestInfo {
    public:
     RequestInfo(const std::string& hostname, int port)
         : hostname_(hostname),
           port_(port),
           allow_cached_response_(true),
           is_speculative_(false) {}
@@ skipping 141 matching lines @@
 };
 
 // Creates a HostResolver implementation that queries the underlying system.
 // (Except if a unit-test has changed the global HostResolverProc using
 // ScopedHostResolverProc to intercept requests to the system).
 HostResolver* CreateSystemHostResolver();
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_RESOLVER_H_