Revert of add UseCounters for NonOctalDecimalIntegerLiteral in strict mode

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index 386caf191a814dd2c41b425c8e7d619cc8310251..484d4b977e04c66bd26d3b42d860e00195fd6802 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -616,18 +616,6 @@
       ReportMessageAt(octal, message);
       scanner()->clear_octal_position();
       *ok = false;
-    }
-  }
-  // for now, this check just collects statistics.
-  void CheckDecimalLiteralWithLeadingZero(int* use_counts, int beg_pos,
-                                          int end_pos) {
-    Scanner::Location token_location =
-        scanner()->decimal_with_leading_zero_position();
-    if (token_location.IsValid() && beg_pos <= token_location.beg_pos &&
-        token_location.end_pos <= end_pos) {
-      scanner()->clear_decimal_with_leading_zero_position();
-      if (use_counts != nullptr)
-        ++use_counts[v8::Isolate::kDecimalWithLeadingZeroInStrictMode];
     }
   }