Move ProxyConfigService construction onto the IO thread.

net/url_request/url_request_context_builder_unittest.cc

Index: net/url_request/url_request_context_builder_unittest.cc
diff --git a/net/url_request/url_request_context_builder_unittest.cc b/net/url_request/url_request_context_builder_unittest.cc
index 26710d01676b75b1dead2b671c1ec83aaa0c80d8..d5b3b3dd17a452f57e038d78a7f2c06e4100e44f 100644
--- a/net/url_request/url_request_context_builder_unittest.cc
+++ b/net/url_request/url_request_context_builder_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "net/url_request/url_request_context_builder.h"
 
+#include "base/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "net/test/test_server.h"
 #include "net/url_request/url_request.h"
@@ -41,8 +42,7 @@ class URLRequestContextBuilderTest : public PlatformTest {
       : test_server_(
           FilePath(FILE_PATH_LITERAL("net/data/url_request_unittest"))) {
 #if defined(OS_LINUX)
-    builder_.set_proxy_config_service(
-        new ProxyConfigServiceFixed(ProxyConfig::CreateDirect()));
+    builder_.set_glib_task_runner(base::ThreadTaskRunnerHandle::Get());
 #endif  // defined(OS_LINUX)
   }