Delete --harmony-unicode flag

src/scanner.h

Index: src/scanner.h
diff --git a/src/scanner.h b/src/scanner.h
index c842f987b62718b9651e56d7cd900471e788e594..550e069c0ed5d1ba3b8bcc2187b6b31166fd21fb 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -485,9 +485,6 @@ class Scanner {
     harmony_modules_ = modules;
   }
 
-  bool HarmonyUnicode() const { return harmony_unicode_; }
-  void SetHarmonyUnicode(bool unicode) { harmony_unicode_ = unicode; }
-
   // Returns true if there was a line terminator before the peek'ed token,
   // possibly inside a multi-line comment.
   bool HasAnyLineTerminatorBeforeNext() const {
@@ -799,8 +796,6 @@ class Scanner {
   bool has_multiline_comment_before_next_;
   // Whether we scan 'module', 'import', 'export' as keywords.
   bool harmony_modules_;
-  // Whether we allow \u{xxxxx}.
-  bool harmony_unicode_;
 };
 
 } }  // namespace v8::internal