Do not suppress referrers for '<a ... rel="noopener">'.

third_party/WebKit/Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 92 matching lines @@
     // Start a system drag and drop operation.
     virtual void startDragging(LocalFrame*, const WebDragData&, WebDragOperationsMask, const WebImage& dragImage, const WebPoint& dragImageOffset) = 0;
     virtual bool acceptsLoadDrops() const = 0;
 
     // The LocalFrame pointer provides the ChromeClient with context about which
     // LocalFrame wants to create the new Page. Also, the newly created window
     // should not be shown to the user until the ChromeClient of the newly
     // created Page has its show method called.
     // The FrameLoadRequest parameter is only for ChromeClient to check if the
     // request could be fulfilled. The ChromeClient should not load the request.
-    virtual Page* createWindow(LocalFrame*, const FrameLoadRequest&, const WindowFeatures&, NavigationPolicy, ShouldSetOpener) = 0;
+    virtual Page* createWindow(LocalFrame*, const FrameLoadRequest&, const WindowFeatures&, NavigationPolicy) = 0;
     virtual void show(NavigationPolicy = NavigationPolicyIgnore) = 0;
 
     void setWindowFeatures(const WindowFeatures&);
 
     // All the parameters should be in viewport space. That is, if an event
     // scrolls by 10 px, but due to a 2X page scale we apply a 5px scroll to the
     // root frame, all of which is handled as overscroll, we should return 10px
     // as the overscrollDelta.
     virtual void didOverscroll(
         const FloatSize& overscrollDelta,
@@ skipping 174 matching lines @@
 
     LayoutPoint m_lastToolTipPoint;
     String m_lastToolTipText;
 
     FRIEND_TEST_ALL_PREFIXES(ChromeClientTest, SetToolTipFlood);
 };
 
 } // namespace blink
 
 #endif // ChromeClient_h