[parser] Drop explicit shorthand property LET detection

It's automatically detected in VariableDeclarationParsingScope::Declare.

Change-Id: I2cf406ebd2dcd66eefb3d709289e0a8d162d0251
Reviewed-on: https://chromium-review.googlesource.com/c/1463783Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59512}

src/parsing/expression-scope.h

@@ -163,11 +163,6 @@ class ExpressionScope {
     AsExpressionParsingScope()->RecordExpressionError(loc, message);
   }
 
-  void RecordLexicalDeclarationError(const Scanner::Location& loc,
-                                     MessageTemplate message) {
-    if (IsLexicalDeclaration()) Report(loc, message);
-  }
-
   void RecordNonSimpleParameter() {
     if (!IsArrowHeadParsingScope()) return;
     AsArrowHeadParsingScope()->RecordNonSimpleParameter();

src/parsing/parser-base.h

@@ -2333,10 +2333,6 @@ ParserBase<Impl>::ParseObjectPropertyDefinition(ParsePropertyInfo* prop_info,
 
       DCHECK(!prop_info->is_computed_name);
 
-      if (name_token == Token::LET) {
-        expression_scope()->RecordLexicalDeclarationError(
-            scanner()->location(), MessageTemplate::kLetInLexicalBinding);
-      }
       if (name_token == Token::AWAIT) {
         DCHECK(!is_async_function());
         expression_scope()->RecordAsyncArrowParametersError(