Get rid of PreParserIdentifier.

src/scanner.cc

Index: src/scanner.cc
diff --git a/src/scanner.cc b/src/scanner.cc
index de1b8e8b7202d211b297e8ca5737fb8f411299ed..43baa9e23244a43646abc6579bf7e42945e17ad5 100644
--- a/src/scanner.cc
+++ b/src/scanner.cc
@@ -1158,6 +1158,14 @@ static Token::Value KeywordOrIdentifierToken(const uint8_t* input,
 }
 
 
+bool Scanner::IdentifierIsFutureReserved(const AstRawString* string) const {
+  return Token::FUTURE_RESERVED_WORD ==
+         KeywordOrIdentifierToken(string->raw_data(), string->length(),
+                                  harmony_scoping_, harmony_modules_,
+                                  harmony_classes_);
+}
+
+
 bool Scanner::IdentifierIsFutureStrictReserved(
     const AstRawString* string) const {
   // Keywords are always 1-byte strings.