Ensure proper finalization of garbage-collected types.

Source/core/css/CSSBasicShapes.cpp

Index: Source/core/css/CSSBasicShapes.cpp
diff --git a/Source/core/css/CSSBasicShapes.cpp b/Source/core/css/CSSBasicShapes.cpp
index e257f609ed4d6bb4b816512fdc43cc469cbd2c1b..2a91241d59364d306bd92a0f88a46b532e56cd7f 100644
--- a/Source/core/css/CSSBasicShapes.cpp
+++ b/Source/core/css/CSSBasicShapes.cpp
@@ -39,6 +39,8 @@ using namespace WTF;
 
 namespace WebCore {
 
+DEFINE_EMPTY_DESTRUCTOR_WILL_BY_NONE(CSSBasicShape)
+
 static String buildRectangleString(const String& x, const String& y, const String& width, const String& height, const String& radiusX, const String& radiusY, const String& layoutBox)
 {
     const char opening[] = "rectangle(";