Remove --harmony-exponentiation-operator flag

src/parsing/scanner.cc

Index: src/parsing/scanner.cc
diff --git a/src/parsing/scanner.cc b/src/parsing/scanner.cc
index 224aa401d061dbf3db70f3fa3692a9b1dae1e02a..154811a552455137375290db5673cfaf0e44c73d 100644
--- a/src/parsing/scanner.cc
+++ b/src/parsing/scanner.cc
@@ -41,8 +41,7 @@ Scanner::Scanner(UnicodeCache* unicode_cache)
       bookmark_c0_(kNoBookmark),
       octal_pos_(Location::invalid()),
       decimal_with_leading_zero_pos_(Location::invalid()),
-      found_html_comment_(false),
-      allow_harmony_exponentiation_operator_(false) {
+      found_html_comment_(false) {
   bookmark_current_.literal_chars = &bookmark_current_literal_;
   bookmark_current_.raw_literal_chars = &bookmark_current_raw_literal_;
   bookmark_next_.literal_chars = &bookmark_next_literal_;
@@ -581,7 +580,7 @@ void Scanner::Scan() {
       case '*':
         // * *=
         Advance();
-        if (c0_ == '*' && allow_harmony_exponentiation_operator()) {
+        if (c0_ == '*') {
           token = Select('=', Token::ASSIGN_EXP, Token::EXP);
         } else if (c0_ == '=') {
           token = Select(Token::ASSIGN_MUL);