Documentation cleanup.

R=ppi@chromium.org, ppi

Review URL: https://codereview.chromium.org/2006623002 .
diff --git a/shell/android/ui_application_loader_android.h b/shell/android/ui_application_loader_android.h
index b3c3e94..3a08b04 100644
--- a/shell/android/ui_application_loader_android.h
+++ b/shell/android/ui_application_loader_android.h
@@ -35,9 +35,7 @@
   class UILoader;
 
   // These functions are exected on the background thread. They call through
-  // to |background_loader_| to do the actual loading.
-  // TODO: having this code take a |manager| is fragile (as ApplicationManager
-  // isn't thread safe).
+  // to |loader_| to do the actual loading.
   void LoadOnUIThread(
       const GURL& url,
       mojo::InterfaceRequest<mojo::Application> application_request);