Clean up creation of "detached" SVG* data type objects

third_party/WebKit/Source/core/svg/SVGPreserveAspectRatioTearOff.h

Index: third_party/WebKit/Source/core/svg/SVGPreserveAspectRatioTearOff.h
diff --git a/third_party/WebKit/Source/core/svg/SVGPreserveAspectRatioTearOff.h b/third_party/WebKit/Source/core/svg/SVGPreserveAspectRatioTearOff.h
index 5efdbafc64280d52f8710578651d667769a594d1..8f8ad21f62a773eaf45ebdd52706de6b640fe398 100644
--- a/third_party/WebKit/Source/core/svg/SVGPreserveAspectRatioTearOff.h
+++ b/third_party/WebKit/Source/core/svg/SVGPreserveAspectRatioTearOff.h
@@ -79,7 +79,7 @@ class SVGPreserveAspectRatioTearOff final
       SVGPreserveAspectRatio* target,
       SVGElement* context_element,
       PropertyIsAnimValType property_is_anim_val,
-      const QualifiedName& attribute_name = QualifiedName::Null()) {
+      const QualifiedName& attribute_name) {
     return new SVGPreserveAspectRatioTearOff(
         target, context_element, property_is_anim_val, attribute_name);
   }
@@ -92,11 +92,10 @@ class SVGPreserveAspectRatioTearOff final
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  private:
-  SVGPreserveAspectRatioTearOff(
-      SVGPreserveAspectRatio*,
-      SVGElement* context_element,
-      PropertyIsAnimValType,
-      const QualifiedName& attribute_name = QualifiedName::Null());
+  SVGPreserveAspectRatioTearOff(SVGPreserveAspectRatio*,
+                                SVGElement* context_element,
+                                PropertyIsAnimValType,
+                                const QualifiedName& attribute_name);
 };
 
 }  // namespace blink