Remove LayoutBlock::deleteLineBoxTree().

third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 119 matching lines @@
         return nullptr;
     }
     if (object) {
         // |object->parent()| can be null if the object is not yet attached
         // to |parent|.
         if (LayoutObject* parent = object->parent()) {
             LayoutBlock* containingBlock = object->containingBlock();
             ASSERT(containingBlock);
             // Since we are moving the |object| to a new parent |fullscreenLayoutObject|,
             // the line box tree underneath our |containingBlock| is not longer valid.
-            containingBlock->deleteLineBoxTree();
+            if (containingBlock->isLayoutBlockFlow())
+                toLayoutBlockFlow(containingBlock)->deleteLineBoxTree();
 
             parent->addChildWithWritingModeOfParent(fullscreenLayoutObject, object);
             object->remove();
 
             // Always just do a full layout to ensure that line boxes get deleted properly.
             // Because objects moved from |parent| to |fullscreenLayoutObject|, we want to
             // make new line boxes instead of leaving the old ones around.
             parent->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
             containingBlock->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
@@ skipping 42 matching lines @@
         m_placeholder->setStyleWithWritingModeOfParent(style);
         if (parent()) {
             parent()->addChildWithWritingModeOfParent(m_placeholder, this);
             parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
     } else {
         m_placeholder->setStyle(style);
         m_placeholder->setStyleWithWritingModeOfParent(style);
     }
 }