Use tighter typing in editing: CompositeEditCommand

Source/core/editing/DeleteSelectionCommand.cpp

 /*
  * Copyright (C) 2005 Apple Computer, 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 18 matching lines @@
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/Text.h"
 #include "core/editing/EditingBoundary.h"
 #include "core/editing/Editor.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
 #include "core/frame/LocalFrame.h"
+#include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/rendering/RenderTableCell.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 static bool isTableCellEmpty(Node* cell)
 {
     ASSERT(isTableCell(cell));
@@ skipping 780 matching lines @@
 
     removePreviouslySelectedEmptyTableRows();
 
     if (!m_needPlaceholder && rootWillStayOpenWithoutPlaceholder) {
         VisiblePosition visualEnding(m_endingPosition);
         bool hasPlaceholder = lineBreakExistsAtVisiblePosition(visualEnding)
             && visualEnding.next(CannotCrossEditingBoundary).isNull();
         m_needPlaceholder = hasPlaceholder && lineBreakBeforeStart && !lineBreakAtEndOfSelectionToDelete;
     }
 
-    RefPtrWillBeRawPtr<Node> placeholder = m_needPlaceholder ? createBreakElement(document()) : nullptr;
+    RefPtrWillBeRawPtr<HTMLBRElement> placeholder = m_needPlaceholder ? createBreakElement(document()) : nullptr;
 
     if (placeholder) {
         if (m_sanitizeMarkup)
             removeRedundantBlocks();
         insertNodeAt(placeholder.get(), m_endingPosition);
     }
 
     rebalanceWhitespaceAt(m_endingPosition);
 
     calculateTypingStyleAfterDelete();
@@ skipping 34 matching lines @@
     visitor->trace(m_deleteIntoBlockquoteStyle);
     visitor->trace(m_startRoot);
     visitor->trace(m_endRoot);
     visitor->trace(m_startTableRow);
     visitor->trace(m_endTableRow);
     visitor->trace(m_temporaryPlaceholder);
     CompositeEditCommand::trace(visitor);
 }
 
 } // namespace blink