Revert of [regexp] extend property classes by script category.

src/char-predicates-inl.h

Index: src/char-predicates-inl.h
diff --git a/src/char-predicates-inl.h b/src/char-predicates-inl.h
index e6cab59921c12443cbb624f58d1a605ac5625b55..ab5caa755732155d367903f1984cf168f4ab3ef3 100644
--- a/src/char-predicates-inl.h
+++ b/src/char-predicates-inl.h
@@ -41,10 +41,6 @@
 
 inline bool IsAlphaNumeric(uc32 c) {
   return IsInRange(AsciiAlphaToLower(c), 'a', 'z') || IsDecimalDigit(c);
-}
-
-inline bool IsAlpha(uc32 c) {
-  return IsInRange(AsciiAlphaToLower(c), 'a', 'z');
 }
 
 inline bool IsDecimalDigit(uc32 c) {