Use ConstructFromLiteral instead of implicit conversion

Source/core/svg/SVGAnimatedAngle.cpp

 /*
  * Copyright (C) 2014 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
     , m_orientType(SVGAnimatedEnumeration<SVGMarkerOrientType>::create(contextElement, SVGNames::orientAttr, baseValue()->orientType()))
 {
 }
 
 SVGAnimatedAngle::~SVGAnimatedAngle()
 {
 }
 
 void SVGAnimatedAngle::synchronizeAttribute()
 {
+    DEFINE_STATIC_LOCAL(const AtomicString, autoValue, ("auto", AtomicString::ConstructFromLiteral));
     AtomicString value;
     if (m_orientType->currentValue()->enumValue() == SVGMarkerOrientAuto)
-        value = "auto";
+        value = autoValue;
     else
         value = AtomicString(currentValue()->valueAsString());
 
     contextElement()->setSynchronizedLazyAttribute(attributeName(), value);
 }
 
 void SVGAnimatedAngle::setAnimatedValue(PassRefPtr<SVGPropertyBase> value)
 {
     SVGAnimatedProperty<SVGAngle>::setAnimatedValue(value);
     m_orientType->setAnimatedValue(currentValue()->orientType());
 }
 
 void SVGAnimatedAngle::animationEnded()
 {
     SVGAnimatedProperty<SVGAngle>::animationEnded();
     m_orientType->animationEnded();
 }
 
 }