Remove the old multicol implementation.

Source/core/layout/TextAutosizer.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 154 matching lines @@
 {
     ASSERT(isPotentialClusterRoot(layoutObject));
 
     LayoutBlock* containingBlock = layoutObject->containingBlock();
     return layoutObject->isLayoutView()
         || layoutObject->isFloating()
         || layoutObject->isOutOfFlowPositioned()
         || layoutObject->isTableCell()
         || layoutObject->isTableCaption()
         || layoutObject->isFlexibleBoxIncludingDeprecated()
-        || layoutObject->hasColumns()
         || (containingBlock && containingBlock->isHorizontalWritingMode() != layoutObject->isHorizontalWritingMode())
         || layoutObject->style()->isDisplayReplacedType()
         || layoutObject->isTextArea()
         || layoutObject->style()->userModify() != READ_ONLY;
 }
 
 static bool blockIsRowOfLinks(const LayoutBlock* block)
 {
     // A "row of links" is a block for which:
     //  1. It does not contain non-link text elements longer than 3 characters
@@ skipping 983 matching lines @@
     }
     return computedSize;
 }
 
 DEFINE_TRACE(TextAutosizer)
 {
     visitor->trace(m_document);
 }
 
 } // namespace blink