Remove -webkit-line-box-contain implementation.

Source/core/layout/line/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 469 matching lines @@
         }
 
         if (curr->isInlineFlowBox())
             toInlineFlowBox(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
     }
 }
 
 void InlineFlowBox::computeLogicalBoxHeights(RootInlineBox* rootBox, LayoutUnit& maxPositionTop, LayoutUnit& maxPositionBottom, int& maxAscent, int& maxDescent, bool& setMaxAscent, bool& setMaxDescent, bool strictMode, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, FontBaseline baselineType, VerticalPositionCache& verticalPositionCache)
 {
     // The primary purpose of this function is to compute the maximal ascent and descent values for
-    // a line. These values are computed based off the block's line-box-contain property, which indicates
-    // what parts of descendant boxes have to fit within the line.
+    // a line.
     //
     // The maxAscent value represents the distance of the highest point of any box (typically including line-height) from
     // the root box's baseline. The maxDescent value represents the distance of the lowest point of any box
     // (also typically including line-height) from the root box baseline. These values can be negative.
     //
     // A secondary purpose of this function is to store the offset of every box's baseline from the root box's
     // baseline. This information is cached in the logicalTop() of every box. We're effectively just using
     // the logicalTop() as scratch space.
     //
     // Because a box can be positioned such that it ends up fully above or fully below the
@@ skipping 807 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace blink