Replaced PassRefPtr copies with moves in Source/core.

third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 182 matching lines @@
 
 void LayoutFullScreen::createPlaceholder(PassRefPtr<ComputedStyle> style, const LayoutRect& frameRect)
 {
     if (style->width().isAuto())
         style->setWidth(Length(frameRect.width(), Fixed));
     if (style->height().isAuto())
         style->setHeight(Length(frameRect.height(), Fixed));
 
     if (!m_placeholder) {
         m_placeholder = new LayoutFullScreenPlaceholder(this);
-        m_placeholder->setStyleWithWritingModeOfParent(style);
+        m_placeholder->setStyleWithWritingModeOfParent(std::move(style));
         if (parent()) {
             parent()->addChildWithWritingModeOfParent(m_placeholder, this);
             parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
     } else {
-        m_placeholder->setStyle(style);
-        m_placeholder->setStyleWithWritingModeOfParent(style);
+        m_placeholder->setStyle(std::move(style));
+        m_placeholder->setStyleWithWritingModeOfParent(std::move(style));
     }
 }