Make NGFragment to own NGPhysicalFragment

third_party/WebKit/Source/core/layout/ng/ng_fragment_base.h

Index: third_party/WebKit/Source/core/layout/ng/ng_fragment_base.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_fragment_base.h b/third_party/WebKit/Source/core/layout/ng/ng_fragment_base.h
index 9e4ada820961813086208de95bfa961a9388ea78..0c4a38373adcdf3d21c963e244bd305acd2ac7f8 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_fragment_base.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_fragment_base.h
@@ -17,7 +17,8 @@ namespace blink {
 
 class NGPhysicalFragmentBase;
 
-class CORE_EXPORT NGFragmentBase : public GarbageCollected<NGFragmentBase> {
+class CORE_EXPORT NGFragmentBase
+    : public GarbageCollectedFinalized<NGFragmentBase> {
  public:
   NGWritingMode WritingMode() const {
     return static_cast<NGWritingMode>(writing_mode_);
@@ -39,10 +40,10 @@ class CORE_EXPORT NGFragmentBase : public GarbageCollected<NGFragmentBase> {
   NGMarginStrut MarginStrut() const;
 
   NGPhysicalFragmentBase* PhysicalFragment() const {
-    return physical_fragment_;
+    return physical_fragment_.get();
   };
 
-  DECLARE_TRACE();
+  DEFINE_INLINE_TRACE(){};
 
  protected:
   NGFragmentBase(NGWritingMode writing_mode,
@@ -52,7 +53,7 @@ class CORE_EXPORT NGFragmentBase : public GarbageCollected<NGFragmentBase> {
         writing_mode_(writing_mode),
         direction_(direction) {}
 
-  Member<NGPhysicalFragmentBase> physical_fragment_;
+  std::unique_ptr<NGPhysicalFragmentBase> physical_fragment_;
 
   unsigned writing_mode_ : 3;
   unsigned direction_ : 1;