Move ProxyConfigService construction onto the IO thread.

net/url_request/url_request_context_builder.h

Index: net/url_request/url_request_context_builder.h
diff --git a/net/url_request/url_request_context_builder.h b/net/url_request/url_request_context_builder.h
index ddbca53991ddf83d1d6aee58c0629e24424e8e6c..ba8642a4c0d0a85c22bd54d0e6e182869b6a4c93 100644
--- a/net/url_request/url_request_context_builder.h
+++ b/net/url_request/url_request_context_builder.h
@@ -23,10 +23,13 @@
 #include "build/build_config.h"
 #include "net/base/net_export.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
 namespace net {
 
 class HostMappingRules;
-class ProxyConfigService;
 class URLRequestContext;
 
 class NET_EXPORT URLRequestContextBuilder {
@@ -80,7 +83,7 @@ class NET_EXPORT URLRequestContextBuilder {
   ~URLRequestContextBuilder();
 
 #if defined(OS_LINUX)
-  void set_proxy_config_service(ProxyConfigService* proxy_config_service);
+  void set_glib_task_runner(base::SingleThreadTaskRunner* glib_task_runner);
 #endif  // defined(OS_LINUX)
 
   // Call this function to specify a hard-coded User-Agent for all requests that
@@ -115,13 +118,13 @@ class NET_EXPORT URLRequestContextBuilder {
  private:
   std::string user_agent_;
   bool ftp_enabled_;
+#if defined(OS_LINUX)
+  base::SingleThreadTaskRunner* glib_task_runner_;
+#endif  // defined(OS_LINUX)
   HostResolverParams host_resolver_params_;
   bool http_cache_enabled_;
   HttpCacheParams http_cache_params_;
   HttpNetworkSessionParams http_network_session_params_;
-#if defined(OS_LINUX)
-  scoped_ptr<ProxyConfigService> proxy_config_service_;
-#endif  // defined(OS_LINUX)
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextBuilder);
 };