Mac: Disconnect DesktopMediaPicker window from the parent before closing

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

Index: chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.mm
diff --git a/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.mm b/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.mm
index 460b0668da4b464d929bed68482f89fd64d95c5e..1cbd15a1180c6773fe944407d7adecf0ff1390b9 100644
--- a/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.mm
+++ b/chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.mm
@@ -229,6 +229,10 @@ const int kExcessButtonPadding = 6;
   // 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