Replaced PassRefPtr copies with moves in Source/core.

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

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. 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 67 matching lines @@
 PassRefPtr<StringImpl> LayoutTextFragment::originalText() const
 {
     RefPtr<StringImpl> result = completeText();
     if (!result)
         return nullptr;
     return result->substring(start(), fragmentLength());
 }
 
 void LayoutTextFragment::setText(PassRefPtr<StringImpl> text, bool force)
 {
-    LayoutText::setText(text, force);
+    LayoutText::setText(std::move(text), force);
 
     m_start = 0;
     m_fragmentLength = textLength();
 
     // If we're the remaining text from a first letter then we have to tell the
     // first letter pseudo element to reattach itself so it can re-calculate the
     // correct first-letter settings.
     if (isRemainingTextLayoutObject()) {
         ASSERT(firstLetterPseudoElement());
         firstLetterPseudoElement()->updateTextFragments();
     }
 }
 
 void LayoutTextFragment::setTextFragment(PassRefPtr<StringImpl> text, unsigned start, unsigned length)
 {
-    LayoutText::setText(text, false);
+    LayoutText::setText(std::move(text), false);
 
     m_start = start;
     m_fragmentLength = length;
 }
 
 void LayoutTextFragment::transformText()
 {
     // Note, we have to call LayoutText::setText here because, if we use our
     // version we will, potentially, screw up the first-letter settings where
     // we only use portions of the string.
@@ skipping 46 matching lines @@
     LayoutObject::updateHitTestResult(result, point);
 
     // If we aren't part of a first-letter element, or if we
     // are part of first-letter but we're the remaining text then return.
     if (m_isRemainingTextLayoutObject || !firstLetterPseudoElement())
         return;
     result.setInnerNode(firstLetterPseudoElement());
 }
 
 } // namespace blink