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

third_party/WebKit/Source/core/animation/StringKeyframe.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/animation/StringKeyframe.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/animation/css/CSSAnimations.h"
 #include "core/css/CSSCustomPropertyDeclaration.h"
 #include "core/css/CSSPropertyMetadata.h"
@@ skipping 125 matching lines @@
     PassRefPtr<TimingFunction> easing) const {
   return Create(offset, std::move(easing), nullptr, EffectModel::kCompositeAdd);
 }
 
 PassRefPtr<Keyframe::PropertySpecificKeyframe>
 StringKeyframe::CSSPropertySpecificKeyframe::CloneWithOffset(
     double offset) const {
   RefPtr<CSSPropertySpecificKeyframe> clone =
       Create(offset, easing_, value_.Get(), composite_);
   clone->animatable_value_cache_ = animatable_value_cache_;
-  return clone.Release();
+  return clone;
 }
 
 PassRefPtr<Keyframe::PropertySpecificKeyframe>
 SVGPropertySpecificKeyframe::CloneWithOffset(double offset) const {
   return Create(offset, easing_, value_, composite_);
 }
 
 PassRefPtr<Keyframe::PropertySpecificKeyframe>
 SVGPropertySpecificKeyframe::NeutralKeyframe(
     double offset,
     PassRefPtr<TimingFunction> easing) const {
   return Create(offset, std::move(easing), String(),
                 EffectModel::kCompositeAdd);
 }
 
 }  // namespace blink