Prototype an 'allow-unsandboxed-auxiliary' sandbox flag.

Source/core/page/CreateWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 101 matching lines @@
     if (features.ySet)
         windowRect.setY(features.y);
     if (features.widthSet)
         windowRect.setWidth(features.width + (windowRect.width() - viewportSize.width()));
     if (features.heightSet)
         windowRect.setHeight(features.height + (windowRect.height() - viewportSize.height()));
 
     host->chrome().setWindowRect(windowRect);
     host->chrome().show(policy);
 
-    frame.loader().forceSandboxFlags(openerFrame.document()->sandboxFlags());
+    if (openerFrame.document()->isSandboxed(SandboxPropagatesToAuxiliaryBrowsingContexts))
+        frame.loader().forceSandboxFlags(openerFrame.document()->sandboxFlags());
 
     created = true;
     return &frame;
 }
 
 LocalFrame* createWindow(const String& urlString, const AtomicString& frameName, const WindowFeatures& windowFeatures,
     LocalDOMWindow& callingWindow, LocalFrame& firstFrame, LocalFrame& openerFrame)
 {
     LocalFrame* activeFrame = callingWindow.frame();
     ASSERT(activeFrame);
@@ skipping 64 matching lines @@
     if (shouldSendReferrer == MaybeSendReferrer) {
         newFrame->loader().setOpener(&openerFrame);
         newFrame->document()->setReferrerPolicy(openerFrame.document()->referrerPolicy());
     }
     FrameLoadRequest newRequest(0, request.resourceRequest());
     newRequest.setFormState(request.formState());
     newFrame->loader().load(newRequest);
 }
 
 } // namespace blink