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

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index 36b86eac93a87926d45778c7dc978709977252a0..9aba4e4918917cd58a752d9d1ddaea23b0b4a548 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -465,7 +465,7 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   // Default behavior is to animate both show and hide.
   void SetVisibilityAnimationTransition(VisibilityTransition transition);
 
-  // Starts a nested message loop that moves the window. This can be used to
+  // Starts a nested run loop that moves the window. This can be used to
   // start a window move operation from a mouse or touch event. This returns
   // when the move completes. |drag_offset| is the offset from the top left
   // corner of the window to the point where the cursor is dragging, and is used