Update a comment in proxy_resolution_service_provider_unittest.cc following deprecation of base::No…

chromeos/dbus/services/proxy_resolution_service_provider_unittest.cc

Index: chromeos/dbus/services/proxy_resolution_service_provider_unittest.cc
diff --git a/chromeos/dbus/services/proxy_resolution_service_provider_unittest.cc b/chromeos/dbus/services/proxy_resolution_service_provider_unittest.cc
index eadba7f8ef51e250026c1efc6af09ed6f1a85056..fbb4345099e572cec00682ba4a11dbac43b4ed2d 100644
--- a/chromeos/dbus/services/proxy_resolution_service_provider_unittest.cc
+++ b/chromeos/dbus/services/proxy_resolution_service_provider_unittest.cc
@@ -178,7 +178,7 @@ class TestDelegate : public ProxyResolutionServiceProvider::Delegate {
   net::ProxyResolver* proxy_resolver_;  // Not owned.
 
   // Created, used, and destroyed on the network thread (since net::ProxyService
-  // derives from base::NonThreadSafe).
+  // is thread-affine (uses ThreadChecker)).
   std::unique_ptr<net::ProxyService> proxy_service_;
 
   scoped_refptr<net::TestURLRequestContextGetter> context_getter_;