Use initializer_lists for static WTF::HashSets.

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

 /*
  * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 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 194 matching lines @@
     }
 
     if (s_lengthModeMap.contains(attrName))
         return s_lengthModeMap.get(attrName);
 
     return SVGLengthMode::Other;
 }
 
 bool SVGLength::negativeValuesForbiddenForAnimatedLengthAttribute(const QualifiedName& attrName)
 {
-    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, s_noNegativeValuesSet, ());
-
-    if (s_noNegativeValuesSet.isEmpty()) {
-        s_noNegativeValuesSet.add(SVGNames::frAttr);
-        s_noNegativeValuesSet.add(SVGNames::rAttr);
-        s_noNegativeValuesSet.add(SVGNames::rxAttr);
-        s_noNegativeValuesSet.add(SVGNames::ryAttr);
-        s_noNegativeValuesSet.add(SVGNames::widthAttr);
-        s_noNegativeValuesSet.add(SVGNames::heightAttr);
-        s_noNegativeValuesSet.add(SVGNames::markerWidthAttr);
-        s_noNegativeValuesSet.add(SVGNames::markerHeightAttr);
-        s_noNegativeValuesSet.add(SVGNames::textLengthAttr);
-    }
-
-    return s_noNegativeValuesSet.contains(attrName);
+    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, noNegativeValuesSet, ({
+        SVGNames::frAttr,
+        SVGNames::rAttr,
+        SVGNames::rxAttr,
+        SVGNames::ryAttr,
+        SVGNames::widthAttr,
+        SVGNames::heightAttr,
+        SVGNames::markerWidthAttr,
+        SVGNames::markerHeightAttr,
+        SVGNames::textLengthAttr,
+    }));
+    return noNegativeValuesSet.contains(attrName);
 }
 
 void SVGLength::add(SVGPropertyBase* other, SVGElement* contextElement)
 {
     SVGLengthContext lengthContext(contextElement);
     setValue(value(lengthContext) + toSVGLength(other)->value(lengthContext), lengthContext);
 }
 
 void SVGLength::calculateAnimatedValue(SVGAnimationElement* animationElement,
     float percentage,
@@ skipping 21 matching lines @@
 
 float SVGLength::calculateDistance(SVGPropertyBase* toValue, SVGElement* contextElement)
 {
     SVGLengthContext lengthContext(contextElement);
     SVGLength* toLength = toSVGLength(toValue);
 
     return fabsf(toLength->value(lengthContext) - value(lengthContext));
 }
 
 } // namespace blink