Clean up BoxClipper

Source/platform/graphics/paint/DisplayItem.h

 // Copyright 2014 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 DisplayItem_h
 #define DisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
 #include "wtf/Assertions.h"
@@ skipping 155 matching lines @@
         BeginSubtreeFirst,
         BeginSubtreePaintPhaseFirst = BeginSubtreeFirst,
         BeginSubtreePaintPhaseLast = BeginSubtreePaintPhaseFirst + PaintPhaseMax,
         BeginSubtreeLast = BeginSubtreePaintPhaseLast,
 
         EndSubtreeFirst,
         EndSubtreePaintPhaseFirst = EndSubtreeFirst,
         EndSubtreePaintPhaseLast = EndSubtreePaintPhaseFirst + PaintPhaseMax,
         EndSubtreeLast = EndSubtreePaintPhaseLast,
 
-        TypeLast = EndSubtreeLast
+        UninitializedType,
+        TypeLast = UninitializedType
     };
 
     struct Id {
         Id(DisplayItemClient c, Type t) : client(c), type(t), scopeId(0), scopeContainer(nullptr)
         {
             ASSERT(c);
         }
 
         bool operator==(const Id& other) const
         {
@@ skipping 164 matching lines @@
     virtual bool isEndAndPairedWith(DisplayItem::Type otherType) const override = 0;
 #endif
 
 private:
     virtual bool isEnd() const override final { return true; }
 };
 
 } // namespace blink
 
 #endif // DisplayItem_h