Implement unicode bidi P2 and P3 rules in BidiResolver

Source/wtf/text/WTFString.h

Index: Source/wtf/text/WTFString.h
diff --git a/Source/wtf/text/WTFString.h b/Source/wtf/text/WTFString.h
index a11c34972f4de80bc85898b1037de9b8645d26cc..8a1f61534da09aed54136b012ba3ca6b5c72b625 100644
--- a/Source/wtf/text/WTFString.h
+++ b/Source/wtf/text/WTFString.h
@@ -423,16 +423,6 @@ public:
     static String fromUTF8WithLatin1Fallback(const LChar*, size_t);
     static String fromUTF8WithLatin1Fallback(const char* s, size_t length) { return fromUTF8WithLatin1Fallback(reinterpret_cast<const LChar*>(s), length); };
 
-    // Determines the writing direction using the Unicode Bidi Algorithm rules P2 and P3.
-    WTF::Unicode::Direction defaultWritingDirection(bool* hasStrongDirectionality = 0) const
-    {
-        if (m_impl)
-            return m_impl->defaultWritingDirection(hasStrongDirectionality);
-        if (hasStrongDirectionality)
-            *hasStrongDirectionality = false;
-        return WTF::Unicode::LeftToRight;
-    }
-
     bool containsOnlyASCII() const;
     bool containsOnlyLatin1() const;
     bool containsOnlyWhitespace() const { return !m_impl || m_impl->containsOnlyWhitespace(); }