Make NGFragment to own NGPhysicalFragment

third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.cc b/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.cc
index e67874631162059d63fa68d355f712b96d599dd9..03903c0ad9f6c99a87346b5564a6300a72f3c520 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.cc
@@ -7,13 +7,4 @@
 #include "core/layout/ng/ng_physical_fragment.h"
 #include "core/layout/ng/ng_physical_text_fragment.h"
 
-namespace blink {
-
-DEFINE_TRACE(NGPhysicalFragmentBase) {
-  if (Type() == FragmentText)
-    static_cast<NGPhysicalTextFragment*>(this)->traceAfterDispatch(visitor);
-  else
-    static_cast<NGPhysicalFragment*>(this)->traceAfterDispatch(visitor);
-}
-
-}  // namespace blink
+namespace blink {}  // namespace blink