[es6] Remove harmony-classes flag

src/scanner.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #ifndef V8_SCANNER_H_
 #define V8_SCANNER_H_
 
 #include "src/allocation.h"
@@ skipping 465 matching lines @@
   // characters, but works for seeking forward until simple delimiter
   // tokens, which is what it is used for.
   void SeekForward(int pos);
 
   bool HarmonyModules() const {
     return harmony_modules_;
   }
   void SetHarmonyModules(bool modules) {
     harmony_modules_ = modules;
   }
-  bool HarmonyClasses() const {
-    return harmony_classes_;
-  }
-  void SetHarmonyClasses(bool classes) {
-    harmony_classes_ = classes;
-  }
+
   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 {
     return has_line_terminator_before_next_ ||
            has_multiline_comment_before_next_;
   }
 
@@ skipping 294 matching lines @@
 
   // Whether there is a line terminator whitespace character after
   // the current token, and  before the next. Does not count newlines
   // inside multiline comments.
   bool has_line_terminator_before_next_;
   // Whether there is a multi-line comment that contains a
   // line-terminator after the current token, and before the next.
   bool has_multiline_comment_before_next_;
   // Whether we scan 'module', 'import', 'export' as keywords.
   bool harmony_modules_;
-  // Whether we scan 'class', 'extends', 'static' and 'super' as keywords.
-  bool harmony_classes_;
   // Whether we allow \u{xxxxx}.
   bool harmony_unicode_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_H_