Replaced PassRefPtr copies with moves in Source/core.

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 5108 matching lines @@
     // Send a notification if the origin has been updated.
     if (standInOrigin && !standInOrigin->isUnique() && getSecurityOrigin()->isUnique()) {
         getSecurityOrigin()->setUniqueOriginIsPotentiallyTrustworthy(standInOrigin->isPotentiallyTrustworthy());
         if (frame())
             frame()->loader().client()->didUpdateToUniqueOrigin();
     }
 }
 
 void Document::updateSecurityOrigin(PassRefPtr<SecurityOrigin> origin)
 {
-    setSecurityOrigin(origin);
+    setSecurityOrigin(std::move(origin));
     didUpdateSecurityOrigin();
 }
 
 void Document::didUpdateSecurityOrigin()
 {
     if (!m_frame)
         return;
     m_frame->script().updateSecurityOrigin(getSecurityOrigin());
 }
 
@@ skipping 909 matching lines @@
 }
 
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().getString().utf8().data());
 }
 #endif