Revert of Make ProfileIOData's ProxyService fetch PACs with the main URLRequestContext

net/test/embedded_test_server/embedded_test_server.cc

Index: net/test/embedded_test_server/embedded_test_server.cc
diff --git a/net/test/embedded_test_server/embedded_test_server.cc b/net/test/embedded_test_server/embedded_test_server.cc
index 83112a2baee65a2d12c2ac58d856cf5e09fa620f..0f89bd9c9e4ad8aec00628a3a8ea2bdc849abddc 100644
--- a/net/test/embedded_test_server/embedded_test_server.cc
+++ b/net/test/embedded_test_server/embedded_test_server.cc
@@ -78,7 +78,7 @@
 
 void EmbeddedTestServer::SetConnectionListener(
     EmbeddedTestServerConnectionListener* listener) {
-  DCHECK(!io_thread_.get());
+  DCHECK(!Started());
   connection_listener_ = listener;
 }