Simplify use of TextDirection enum.

Source/platform/fonts/WidthIterator.cpp

Index: Source/platform/fonts/WidthIterator.cpp
diff --git a/Source/platform/fonts/WidthIterator.cpp b/Source/platform/fonts/WidthIterator.cpp
index 4775b50094e4ce8adf140433e1bb14d899d16000..8816fd8158fde2c8bcb73270715bf0ecc6f6a7f5 100644
--- a/Source/platform/fonts/WidthIterator.cpp
+++ b/Source/platform/fonts/WidthIterator.cpp
@@ -59,7 +59,7 @@ WidthIterator::WidthIterator(const Font* font, const TextRun& run, HashSet<const
         m_expansionPerOpportunity = 0;
     else {
         bool isAfterExpansion = m_isAfterExpansion;
-        unsigned expansionOpportunityCount = m_run.is8Bit() ? Character::expansionOpportunityCount(m_run.characters8(), m_run.length(), m_run.ltr() ? LTR : RTL, isAfterExpansion) : Character::expansionOpportunityCount(m_run.characters16(), m_run.length(), m_run.ltr() ? LTR : RTL, isAfterExpansion);
+        unsigned expansionOpportunityCount = m_run.is8Bit() ? Character::expansionOpportunityCount(m_run.characters8(), m_run.length(), m_run.direction(), isAfterExpansion) : Character::expansionOpportunityCount(m_run.characters16(), m_run.length(), m_run.direction(), isAfterExpansion);
         if (isAfterExpansion && !m_run.allowsTrailingExpansion())
             expansionOpportunityCount--;
 
@@ -98,7 +98,7 @@ public:
 
 typedef Vector<pair<int, OriginalAdvancesForCharacterTreatedAsSpace>, 64> CharactersTreatedAsSpace;
 
-static inline float applyFontTransforms(GlyphBuffer* glyphBuffer, bool ltr, unsigned& lastGlyphCount, const SimpleFontData* fontData, TypesettingFeatures typesettingFeatures, CharactersTreatedAsSpace& charactersTreatedAsSpace)
+static inline float applyFontTransforms(GlyphBuffer* glyphBuffer, unsigned& lastGlyphCount, TypesettingFeatures typesettingFeatures, CharactersTreatedAsSpace& charactersTreatedAsSpace)
 {
     ASSERT(typesettingFeatures & (Kerning | Ligatures));
 
@@ -178,7 +178,7 @@ inline unsigned WidthIterator::advanceInternal(TextIterator& textIterator, Glyph
 
         if (fontData != lastFontData && width) {
             if (shouldApplyFontTransforms())
-                m_runWidthSoFar += applyFontTransforms(glyphBuffer, m_run.ltr(), lastGlyphCount, lastFontData, m_typesettingFeatures, charactersTreatedAsSpace);
+                m_runWidthSoFar += applyFontTransforms(glyphBuffer, lastGlyphCount, m_typesettingFeatures, charactersTreatedAsSpace);
 
             lastFontData = fontData;
             if (m_fallbackFonts && fontData != primaryFont) {
@@ -299,7 +299,7 @@ inline unsigned WidthIterator::advanceInternal(TextIterator& textIterator, Glyph
     }
 
     if (shouldApplyFontTransforms())
-        m_runWidthSoFar += applyFontTransforms(glyphBuffer, m_run.ltr(), lastGlyphCount, lastFontData, m_typesettingFeatures, charactersTreatedAsSpace);
+        m_runWidthSoFar += applyFontTransforms(glyphBuffer, lastGlyphCount, m_typesettingFeatures, charactersTreatedAsSpace);
 
     unsigned consumedCharacters = textIterator.currentCharacter() - m_currentCharacter;
     m_currentCharacter = textIterator.currentCharacter();