Replaced PassRefPtr copies with moves in Source/core.

third_party/WebKit/Source/core/style/ComputedStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 1439 matching lines @@
     return m_rareInheritedData->variables.get();
 }
 
 void ComputedStyle::setVariable(const AtomicString& name, PassRefPtr<CSSVariableData> value)
 {
     RefPtr<StyleVariableData>& variables = m_rareInheritedData.access()->variables;
     if (!variables)
         variables = StyleVariableData::create();
     else if (!variables->hasOneRef())
         variables = variables->copy();
-    variables->setVariable(name, value);
+    variables->setVariable(name, std::move(value));
 }
 
 void ComputedStyle::removeVariable(const AtomicString& name)
 {
     RefPtr<StyleVariableData>& variables = m_rareInheritedData.access()->variables;
     if (!variables)
         return;
     if (!variables->hasOneRef())
         variables = variables->copy();
     variables->removeVariable(name);
@@ skipping 574 matching lines @@
         if (value < 0)
             fvalue -= 0.5f;
         else
             fvalue += 0.5f;
     }
 
     return roundForImpreciseConversion<int>(fvalue / zoomFactor);
 }
 
 } // namespace blink