Mac: Disconnect DesktopMediaPicker window from the parent before closing

chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.mm

 // Copyright 2013 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/media_picker/desktop_media_picker_controller.h"
 
 #include "base/bind.h"
 #import "base/mac/bundle_locations.h"
 #include "base/strings/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/media_picker/desktop_media_picker_item.h"
@@ skipping 211 matching lines @@
   [GTMUILocalizerAndLayoutTweaker sizeToFitView:button];
   return button.autorelease();
 }
 
 #pragma mark NSWindowDelegate
 
 - (void)windowWillClose:(NSNotification*)notification {
   // Report the result if it hasn't been reported yet. |reportResult:| ensures
   // that the result is only reported once.
   [self reportResult:content::DesktopMediaID()];
+
+  // Remove self from the parent.
+  NSWindow* window = [self window];
+  [[window parentWindow] removeChildWindow:window];
 }
 
 #pragma mark IKImageBrowserDataSource
 
 - (NSUInteger)numberOfItemsInImageBrowser:(IKImageBrowserView*)browser {
   return [items_ count];
 }
 
 - (id)imageBrowser:(IKImageBrowserView *)browser
        itemAtIndex:(NSUInteger)index {
@@ skipping 47 matching lines @@
 - (void)sourceThumbnailChangedAtIndex:(int)index {
   const DesktopMediaList::Source& source = media_list_->GetSource(index);
   NSImage* image = gfx::NSImageFromImageSkia(source.thumbnail);
 
   DesktopMediaPickerItem* item = [items_ objectAtIndex:index];
   [item setImageRepresentation:image];
   [sourceBrowser_ reloadData];
 }
 
 @end  // @interface DesktopMediaPickerController