Replaced RefPtr::release with std::move 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.
@@ skipping 2015 matching lines @@
   // printing/width-overflow.html though they only fail on mac when accessing
   // the resolver by what appears to be a viewport size difference.
 
   if (change == Force) {
     m_hasNodesWithPlaceholderStyle = false;
     RefPtr<ComputedStyle> documentStyle =
         StyleResolver::styleForDocument(*this);
     StyleRecalcChange localChange = ComputedStyle::stylePropagationDiff(
         documentStyle.get(), layoutViewItem().style());
     if (localChange != NoChange)
-      layoutViewItem().setStyle(documentStyle.release());
+      layoutViewItem().setStyle(std::move(documentStyle));
   }
 
   clearNeedsStyleRecalc();
   clearNeedsReattachLayoutTree();
 
   StyleResolver& resolver = ensureStyleResolver();
 
   bool shouldRecordStats;
   TRACE_EVENT_CATEGORY_GROUP_ENABLED("blink,blink_style", &shouldRecordStats);
   styleEngine().setStatsEnabled(shouldRecordStats);
@@ skipping 4536 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