MacViews: Attach child windows when parent is on the screen.

ui/views/cocoa/native_widget_mac_nswindow.mm

Index: ui/views/cocoa/native_widget_mac_nswindow.mm
diff --git a/ui/views/cocoa/native_widget_mac_nswindow.mm b/ui/views/cocoa/native_widget_mac_nswindow.mm
index 70a3533f04fdf709ffba1ea70e1efa9ee5765b4f..7359fe62964685a90a9217c2013b52c949d05b27 100644
--- a/ui/views/cocoa/native_widget_mac_nswindow.mm
+++ b/ui/views/cocoa/native_widget_mac_nswindow.mm
@@ -123,26 +123,12 @@
     [[self contentView] keyUp:event];
 }
 
-// Override display, since this is the first opportunity Cocoa gives to detect
-// a visibility change in some cases. For example, restoring from the dock first
-// calls -[NSWindow display] before any NSWindowDelegate functions and before
-// ordering the window (and without actually calling -[NSWindow deminiaturize]).
-// By notifying the delegate that a display is about to occur, it can apply a
-// correct visibility state, before [super display] requests a draw of the
-// contentView. -[NSWindow isVisible] can still report NO at this point, so this
-// gives the delegate time to apply correct visibility before the draw occurs.
-- (void)display {
-  [[self viewsNSWindowDelegate] onWindowWillDisplay];
-  [super display];
-}
-
 // Override window order functions to intercept other visibility changes. This
 // is needed in addition to the -[NSWindow display] override because Cocoa
 // hardly ever calls display, and reports -[NSWindow isVisible] incorrectly
 // when ordering in a window for the first time.
 - (void)orderWindow:(NSWindowOrderingMode)orderingMode
          relativeTo:(NSInteger)otherWindowNumber {
-  [[self viewsNSWindowDelegate] onWindowOrderWillChange:orderingMode];
   [super orderWindow:orderingMode relativeTo:otherWindowNumber];
   [[self viewsNSWindowDelegate] onWindowOrderChanged:nil];
 }