Do not zero-initialize RawPtr.

Source/core/css/BasicShapeFunctions.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 51 matching lines @@
     }
 
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 PassRefPtrWillBeRawPtr<CSSValue> valueForBasicShape(const RenderStyle& style, const BasicShape* basicShape)
 {
     CSSValuePool& pool = cssValuePool();
 
-    RefPtrWillBeRawPtr<CSSBasicShape> basicShapeValue;
+    RefPtrWillBeRawPtr<CSSBasicShape> basicShapeValue = nullptr;
     switch (basicShape->type()) {
     case BasicShape::BasicShapeCircleType: {
         const BasicShapeCircle* circle = static_cast<const BasicShapeCircle*>(basicShape);
         RefPtrWillBeRawPtr<CSSBasicShapeCircle> circleValue = CSSBasicShapeCircle::create();
 
         circleValue->setCenterX(valueForCenterCoordinate(pool, style, circle->centerX(), HORIZONTAL));
         circleValue->setCenterY(valueForCenterCoordinate(pool, style, circle->centerY(), VERTICAL));
         circleValue->setRadius(basicShapeRadiusToCSSValue(pool, style, circle->radius()));
         basicShapeValue = circleValue.release();
         break;
@@ skipping 188 matching lines @@
 {
     FloatPoint p;
     float offset = floatValueForLength(centerX.length(), boxSize.width());
     p.setX(centerX.direction() == BasicShapeCenterCoordinate::TopLeft ? offset : boxSize.width() - offset);
     offset = floatValueForLength(centerY.length(), boxSize.height());
     p.setY(centerY.direction() == BasicShapeCenterCoordinate::TopLeft ? offset : boxSize.height() - offset);
     return p;
 }
 
 }