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

ui/views/cocoa/native_widget_mac_nswindow.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ui/views/cocoa/native_widget_mac_nswindow.h"
 
 #include "base/mac/foundation_util.h"
 #import "ui/views/cocoa/bridged_native_widget.h"
 #import "ui/base/cocoa/user_interface_item_command_handler.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
@@ skipping 124 matching lines @@
   [[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];
 }
 
 // NSResponder implementation.
 
 - (BOOL)performKeyEquivalent:(NSEvent*)event {
   return [commandDispatcher_ performKeyEquivalent:event];
 }
 
@@ skipping 53 matching lines @@
     id appController = [NSApp delegate];
     DCHECK([appController
         conformsToProtocol:@protocol(NSUserInterfaceValidations)]);
     return [appController validateUserInterfaceItem:item];
   }
 
   return [super validateUserInterfaceItem:item];
 }
 
 @end