Remove --harmony-scoping flag.

src/scanner.h

Index: src/scanner.h
diff --git a/src/scanner.h b/src/scanner.h
index 1ef6aa8f53b09434c75de2b4d356c71143c7e963..bac53f02a8bfc4bf103dc60b5fc2d7eba6305a22 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -444,12 +444,6 @@ class Scanner {
   // tokens, which is what it is used for.
   void SeekForward(int pos);
 
-  bool HarmonyScoping() const {
-    return harmony_scoping_;
-  }
-  void SetHarmonyScoping(bool scoping) {
-    harmony_scoping_ = scoping;
-  }
   bool HarmonyModules() const {
     return harmony_modules_;
   }
@@ -745,8 +739,6 @@ class Scanner {
   // 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 'let' as a keyword for harmony block-scoped let bindings.
-  bool harmony_scoping_;
   // Whether we scan 'module', 'import', 'export' as keywords.
   bool harmony_modules_;
   // Whether we scan 0o777 and 0b111 as numbers.