Linux: fix a data race in a proxy config service unit test.

net/proxy/proxy_config_service_linux.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/proxy/proxy_config_service_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <gconf/gconf-client.h>
 #include <limits.h>
@@ skipping 1023 matching lines @@
     // Consulting environment variables doesn't need to be done from
     // the default glib main loop, but it's a tiny enough amount of
     // work.
     if (GetConfigFromEnv(&cached_config_)) {
       cached_config_.set_id(1);  // mark it as valid
       LOG(INFO) << "Obtained proxy settings from environment variables";
     }
   }
 }
 
-void ProxyConfigServiceLinux::Delegate::Reset() {
-  DCHECK(!glib_default_loop_ || MessageLoop::current() == glib_default_loop_);
-  gconf_getter_->Shutdown();
-  cached_config_ = ProxyConfig();
-}
-
 int ProxyConfigServiceLinux::Delegate::GetProxyConfig(ProxyConfig* config) {
   // This is called from the IO thread.
   DCHECK(!io_loop_ || MessageLoop::current() == io_loop_);
 
   // Simply return the last proxy configuration that glib_default_loop
   // notified us of.
   *config = cached_config_;
   return cached_config_.is_valid() ? OK : ERR_FAILED;
 }
 
@@ skipping 63 matching lines @@
     : delegate_(new Delegate(env_var_getter)) {
 }
 
 ProxyConfigServiceLinux::ProxyConfigServiceLinux(
     base::EnvironmentVariableGetter* env_var_getter,
     GConfSettingGetter* gconf_getter)
     : delegate_(new Delegate(env_var_getter, gconf_getter)) {
 }
 
 }  // namespace net