Replace open-coded toSVG<type> with DEFINE_SVG_PROPERTY_TYPE_CASTS

third_party/WebKit/Source/core/svg/properties/SVGProperty.h

 /*
  * Copyright (C) 2013 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 89 matching lines @@
 private:
     const AnimatedPropertyType m_type;
 
     // Oilpan: the back reference to the owner should be a Member, but this can create
     // cycles when SVG properties meet the off-heap InterpolationValue hierarchy.
     // Not tracing it is safe, albeit an undesirable state of affairs.
     GC_PLUGIN_IGNORE("528275")
     SVGPropertyBase* m_ownerList;
 };
 
+#define DEFINE_SVG_PROPERTY_TYPE_CASTS(thisType)\
+    DEFINE_TYPE_CASTS(thisType, SVGPropertyBase, value, value->type() == thisType::classType(), value.type() == thisType::classType());\
+    inline PassRefPtrWillBeRawPtr<thisType> to##thisType(PassRefPtrWillBeRawPtr<SVGPropertyBase> passBase)\
+    {\
+        RefPtrWillBeRawPtr<SVGPropertyBase> base = passBase;\
+        ASSERT(base->type() == thisType::classType());\
+        return static_pointer_cast<thisType>(base.release());\
+    }
+
 }
 
 #endif // SVGProperty_h