Simplify SVGAnimated* initialization

third_party/WebKit/Source/core/svg/SVGAnimatedHref.cpp

 // Copyright 2016 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/svg/SVGAnimatedHref.h"
 
 #include "core/SVGNames.h"
 #include "core/XLinkNames.h"
 #include "core/frame/UseCounter.h"
 #include "core/svg/SVGElement.h"
 
 namespace blink {
 
 SVGAnimatedHref* SVGAnimatedHref::create(SVGElement* contextElement) {
   return new SVGAnimatedHref(contextElement);
 }
 
 DEFINE_TRACE(SVGAnimatedHref) {
   visitor->trace(m_xlinkHref);
   SVGAnimatedString::trace(visitor);
 }
 
 SVGAnimatedHref::SVGAnimatedHref(SVGElement* contextElement)
-    : SVGAnimatedString(contextElement,
-                        SVGNames::hrefAttr,
-                        SVGString::create()),
-      m_xlinkHref(SVGAnimatedString::create(contextElement,
-                                            XLinkNames::hrefAttr,
-                                            SVGString::create())) {}
+    : SVGAnimatedString(contextElement, SVGNames::hrefAttr),
+      m_xlinkHref(
+          SVGAnimatedString::create(contextElement, XLinkNames::hrefAttr)) {}
 
 void SVGAnimatedHref::addToPropertyMap(SVGElement* element) {
   element->addToPropertyMap(this);
   element->addToPropertyMap(m_xlinkHref);
 }
 
 bool SVGAnimatedHref::isKnownAttribute(const QualifiedName& attrName) {
   return attrName.matches(SVGNames::hrefAttr) ||
          attrName.matches(XLinkNames::hrefAttr);
 }
@@ skipping 28 matching lines @@
 
 const SVGAnimatedString* SVGAnimatedHref::backingString() const {
   return useXLink() ? m_xlinkHref.get() : this;
 }
 
 bool SVGAnimatedHref::useXLink() const {
   return !SVGAnimatedString::isSpecified() && m_xlinkHref->isSpecified();
 }
 
 }  // namespace blink