Replace "nested message loop" with "nested run loop" in comments.

services/ui/ws/window_manager_client_unittest.cc

Index: services/ui/ws/window_manager_client_unittest.cc
diff --git a/services/ui/ws/window_manager_client_unittest.cc b/services/ui/ws/window_manager_client_unittest.cc
index 91187ed7881d069912e49a8397f590a22093292f..6ac3fc931157ffb2d15b0e00b19c44afa90ff4e6 100644
--- a/services/ui/ws/window_manager_client_unittest.cc
+++ b/services/ui/ws/window_manager_client_unittest.cc
@@ -304,7 +304,7 @@ class WindowServerTest : public WindowServerTestBase {
 
   std::unique_ptr<ClientAreaChange> WaitForClientAreaToChange() {
     client_area_change_ = base::MakeUnique<ClientAreaChange>();
-    // The nested message loop is quit in OnWmSetClientArea(). Client area
+    // The nested run loop is quit in OnWmSetClientArea(). Client area
     // changes don't route through the window, only the WindowManagerDelegate.
     if (!WindowServerTestBase::DoRunLoopWithTimeout()) {
       client_area_change_.reset();