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

ui/base/x/selection_requestor.h

Index: ui/base/x/selection_requestor.h
diff --git a/ui/base/x/selection_requestor.h b/ui/base/x/selection_requestor.h
index 8be12c67bd456abfa1af6429346ca963f18a315e..e698010b9c7dc2cd6a21a672e0c307dda40003dd 100644
--- a/ui/base/x/selection_requestor.h
+++ b/ui/base/x/selection_requestor.h
@@ -38,7 +38,7 @@ class UI_BASE_EXPORT SelectionRequestor {
   ~SelectionRequestor();
 
   // Does the work of requesting |target| from |selection|, spinning up the
-  // nested message loop, and reading the resulting data back. The result is
+  // nested run loop, and reading the resulting data back. The result is
   // stored in |out_data|.
   // |out_data_items| is the length of |out_data| in |out_type| items.
   bool PerformBlockingConvertSelection(
@@ -98,7 +98,7 @@ class UI_BASE_EXPORT SelectionRequestor {
     // The time when the request should be aborted.
     base::TimeTicks timeout;
 
-    // Called to terminate the nested message loop.
+    // Called to terminate the nested run loop.
     base::Closure quit_closure;
 
     // True if the request is complete.