WIP: redirect some LayoutBox methods to ng fragments

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

Index: third_party/WebKit/Source/core/layout/ng/ng_physical_fragment.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment.cc b/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment.cc
index 5bf322177052f7cfee0579fa7e6d74baba3596ec..d4284d73865da9a712f41356f096be97181d8c3a 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_physical_fragment.cc
@@ -22,6 +22,8 @@ NGPhysicalFragment::NGPhysicalFragment(LayoutObject* layout_object,
       type_(type),
       is_placed_(false) {}
 
+NGPhysicalFragment::NGPhysicalFragment() {}
+
 void NGPhysicalFragment::destroy() const {
   if (Type() == kFragmentText)
     delete static_cast<const NGPhysicalTextFragment*>(this);