NGPhysicalFragment implementation to cc file

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NGPhysicalFragment_h
 #define NGPhysicalFragment_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_physical_fragment_base.h"
 #include "core/layout/ng/ng_units.h"
 #include "platform/heap/Handle.h"
-#include "wtf/Vector.h"
 
 namespace blink {
 
 class CORE_EXPORT NGPhysicalFragment final : public NGPhysicalFragmentBase {
  public:
   // This modifies the passed-in children vector.
   NGPhysicalFragment(NGPhysicalSize size,
                      NGPhysicalSize overflow,
                      HeapVector<Member<const NGPhysicalFragmentBase>>& children,
-                     NGMarginStrut margin_strut)
-      : NGPhysicalFragmentBase(size, overflow, FragmentBox),
-        margin_strut_(margin_strut) {
-    children_.swap(children);
-  }
+                     NGMarginStrut margin_strut);
 
   const HeapVector<Member<const NGPhysicalFragmentBase>>& Children() const {
     return children_;
   }
 
   NGMarginStrut MarginStrut() const { return margin_strut_; }
 
-  DEFINE_INLINE_TRACE_AFTER_DISPATCH() {
-    visitor->trace(children_);
-    NGPhysicalFragmentBase::traceAfterDispatch(visitor);
-  }
+  DECLARE_TRACE_AFTER_DISPATCH();
 
  private:
   HeapVector<Member<const NGPhysicalFragmentBase>> children_;
 
   NGMarginStrut margin_strut_;
 };
 
 WILL_NOT_BE_EAGERLY_TRACED_CLASS(NGPhysicalFragment);
 
 DEFINE_TYPE_CASTS(NGPhysicalFragment,
                   NGPhysicalFragmentBase,
                   fragment,
                   fragment->Type() == NGPhysicalFragmentBase::FragmentBox,
                   fragment.Type() == NGPhysicalFragmentBase::FragmentBox);
 
 }  // namespace blink
 
 #endif  // NGPhysicalFragment_h