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

ui/views/cocoa/views_nswindow_delegate.h

Index: ui/views/cocoa/views_nswindow_delegate.h
diff --git a/ui/views/cocoa/views_nswindow_delegate.h b/ui/views/cocoa/views_nswindow_delegate.h
index 7dc64b662366a1cd4dafa54627f7bcc339e2f133..3c0e06e8e41d2015a10a3b1f0c86b516aaaabc15 100644
--- a/ui/views/cocoa/views_nswindow_delegate.h
+++ b/ui/views/cocoa/views_nswindow_delegate.h
@@ -35,10 +35,6 @@ VIEWS_EXPORT
 // Initialize with the given |parent|.
 - (id)initWithBridgedNativeWidget:(views::BridgedNativeWidget*)parent;
 
-// Notify that the window is about to be reordered on screen. This ensures a
-// paint will occur, even if Cocoa has not yet updated the window visibility.
-- (void)onWindowOrderWillChange:(NSWindowOrderingMode)orderingMode;
-
 // Notify that the window has been reordered in (or removed from) the window
 // server's screen list. This is a substitute for -[NSWindowDelegate
 // windowDidExpose:], which is only sent for nonretained windows (those without
@@ -46,9 +42,6 @@ VIEWS_EXPORT
 // a notification such as NSApplicationDidHideNotification.
 - (void)onWindowOrderChanged:(NSNotification*)notification;
 
-// Notify when -[NSWindow display] is being called on the window.
-- (void)onWindowWillDisplay;
-
 // Called on the delegate of a modal sheet when its modal session ends.
 - (void)sheetDidEnd:(NSWindow*)sheet
          returnCode:(NSInteger)returnCode