Revert "Resolve references to "this" the same way as normal variables"

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index 541da23af1acfb83b59426c34e664195844bb9d5..c84009245457610b52a55ef41d8de557f8649c89 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -2220,6 +2220,7 @@ ParserBase<Traits>::ParsePrimaryExpression(ExpressionClassifier* classifier,
           break;
         }
       }
+      scope_->RecordThisUsage();
       result = this->ThisExpression(scope_, factory(), beg_pos);
       break;
     }
@@ -3245,6 +3246,7 @@ ParserBase<Traits>::ParseStrongInitializationExpression(
   Consume(Token::THIS);
   int pos = position();
   function_state_->set_this_location(scanner()->location());
+  scope_->RecordThisUsage();
   ExpressionT this_expr = this->ThisExpression(scope_, factory(), pos);
 
   ExpressionT left = this->EmptyExpression();