Try to fix crash because of InlineBox deletion in a cached subsequence

third_party/WebKit/Source/core/layout/api/LineLayoutItem.h

 // Copyright 2015 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 LineLayoutItem_h
 #define LineLayoutItem_h
 
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutObjectInlines.h"
 
@@ skipping 417 matching lines @@
     bool isHashTableDeletedValue() const
     {
         return m_layoutObject == kHashTableDeletedValue;
     }
 
     void setShouldDoFullPaintInvalidation()
     {
         m_layoutObject->setShouldDoFullPaintInvalidation();
     }
 
+    void slowSetPaintingLayerNeedsRepaint()
+    {
+        m_layoutObject->slowSetPaintingLayerNeedsRepaint();
+    }
+
     struct LineLayoutItemHash {
         STATIC_ONLY(LineLayoutItemHash);
         static unsigned hash(const LineLayoutItem& key) { return WTF::PtrHash<LayoutObject>::hash(key.m_layoutObject); }
         static bool equal(const LineLayoutItem& a, const LineLayoutItem& b)
         {
             return WTF::PtrHash<LayoutObject>::equal(a.m_layoutObject, b.m_layoutObject);
         }
         static const bool safeToCompareToEmptyOrDeleted = true;
     };
 
@@ skipping 48 matching lines @@
 
 template <>
 struct HashTraits<blink::LineLayoutItem> : SimpleClassHashTraits<blink::LineLayoutItem> {
     STATIC_ONLY(HashTraits);
 };
 
 } // namespace WTF
 
 
 #endif // LineLayoutItem_h