Simplify use of TextDirection enum.

Source/platform/fonts/mac/ComplexTextController.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011 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 65 matching lines @@
     , m_minGlyphBoundingBoxY(numeric_limits<float>::max())
     , m_maxGlyphBoundingBoxY(numeric_limits<float>::min())
     , m_lastRoundingGlyph(0)
 {
     if (!m_expansion)
         m_expansionPerOpportunity = 0;
     else {
         bool isAfterExpansion = m_afterExpansion;
         unsigned expansionOpportunityCount;
         if (m_run.is8Bit())
-            expansionOpportunityCount = Character::expansionOpportunityCount(m_run.characters8(), m_end, m_run.ltr() ? LTR : RTL, isAfterExpansion);
+            expansionOpportunityCount = Character::expansionOpportunityCount(m_run.characters8(), m_end, m_run.direction(), isAfterExpansion);
          else
-            expansionOpportunityCount = Character::expansionOpportunityCount(m_run.characters16(), m_end, m_run.ltr() ? LTR : RTL, isAfterExpansion);
+            expansionOpportunityCount = Character::expansionOpportunityCount(m_run.characters16(), m_end, m_run.direction(), isAfterExpansion);
         if (isAfterExpansion && !m_run.allowsTrailingExpansion())
             expansionOpportunityCount--;
 
         if (!expansionOpportunityCount)
             m_expansionPerOpportunity = 0;
         else
             m_expansionPerOpportunity = m_expansion / expansionOpportunityCount;
     }
 
     collectComplexTextRuns();
@@ skipping 561 matching lines @@
 
             lastCharacterIndex = characterIndex;
         }
         if (!isMonotonic)
             complexTextRun.setIsNonMonotonic();
     }
     m_totalWidth += widthSinceLastCommit;
 }
 
 } // namespace WebCore