Mac: Fix window ordering for certificate viewer/selector sheets and overlays.

chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm

 // Copyright (c) 2012 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 "chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.h"
 
 #import <SecurityInterface/SFChooseIdentityPanel.h>
 #include <stddef.h>
 
 #include <utility>
@@ skipping 275 matching lines @@
 
   oldResizesSubviews_ = [[sheetWindow contentView] autoresizesSubviews];
   [[sheetWindow contentView] setAutoresizesSubviews:NO];
 }
 
 - (void)unhideSheet {
   NSWindow* sheetWindow = [overlayWindow_ attachedSheet];
   [[sheetWindow contentView] setAutoresizesSubviews:oldResizesSubviews_];
   [sheetWindow setAlphaValue:1.0];
   [sheetWindow setIgnoresMouseEvents:NO];
+
+  // Reorder child windows so the currently showing sheet/overlay is on top.
+  NSWindow* parent = [overlayWindow_ parentWindow];
+  [parent removeChildWindow:overlayWindow_];
+  [parent addChildWindow:overlayWindow_ ordered:NSWindowAbove];
+  [overlayWindow_ removeChildWindow:sheetWindow];
+  [overlayWindow_ addChildWindow:sheetWindow ordered:NSWindowAbove];
 }
 
 - (void)pulseSheet {
   // NOOP
 }
 
 - (void)makeSheetKeyAndOrderFront {
   [[overlayWindow_ attachedSheet] makeKeyAndOrderFront:nil];
 }
 
@@ skipping 10 matching lines @@
 }
 
 - (void)onConstrainedWindowClosed {
   observer_->StopObserving();
   panel_.reset();
   constrainedWindow_.reset();
   [self release];
 }
 
 @end