[LayoutNG] Remove unnecessary #includes

third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.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 NGPhysicalFragmentBase_h
 #define NGPhysicalFragmentBase_h
 
 #include "core/CoreExport.h"
-#include "core/layout/ng/ng_break_token.h"
-#include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_units.h"
 #include "platform/LayoutUnit.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class NGBlockNode;
+class NGBreakToken;
 
 // The NGPhysicalFragmentBase contains the output information from layout. The
 // fragment stores all of its information in the physical coordinate system for
 // use by paint, hit-testing etc.
 //
 // Layout code should only access output layout information through the
 // NGFragmentBase classes which transforms information into the logical
 // coordinate system.
 class CORE_EXPORT NGPhysicalFragmentBase
     : public GarbageCollectedFinalized<NGPhysicalFragmentBase> {
@@ skipping 63 matching lines @@
   HeapLinkedHashSet<WeakMember<NGBlockNode>> out_of_flow_descendants_;
   Vector<NGStaticPosition> out_of_flow_positions_;
 
   unsigned type_ : 1;
   unsigned has_been_placed_ : 1;
 };
 
 }  // namespace blink
 
 #endif  // NGFragmentBase_h