Removed calls to RefPtr::Release in return statements with auto move.

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceRadialGradient.cpp

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2012 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 55 matching lines @@
 }
 
 PassRefPtr<Gradient> LayoutSVGResourceRadialGradient::BuildGradient() const {
   const RadialGradientAttributes& attributes = this->Attributes();
   RefPtr<Gradient> gradient = Gradient::CreateRadial(
       FocalPoint(attributes), FocalRadius(attributes), CenterPoint(attributes),
       Radius(attributes), 1,
       PlatformSpreadMethodFromSVGType(attributes.SpreadMethod()),
       Gradient::ColorInterpolation::kUnpremultiplied);
   gradient->AddColorStops(attributes.Stops());
-  return gradient.Release();
+  return gradient;
 }
 
 }  // namespace blink