Fixed error introduced in r12761.

src/json-parser.h

Index: src/json-parser.h
diff --git a/src/json-parser.h b/src/json-parser.h
index 3161a01a79cd86ae62a88051090dce6556c15fab..9ccc8ed1fb320c087b0fbaddf01d2b9bc9fddb2b 100644
--- a/src/json-parser.h
+++ b/src/json-parser.h
@@ -400,12 +400,14 @@ Handle<Object> JsonParser<seq_ascii>::ParseJsonNumber() {
     if ('0' <= c0_ && c0_ <= '9') return ReportUnexpectedCharacter();
   } else {
     int i = 0;
+    int digits = 0;
     if (c0_ < '1' || c0_ > '9') return ReportUnexpectedCharacter();
     do {
       i = i * 10 + c0_ - '0';
+      digits++;
       Advance();
-    } while (c0_ >= '0' && c0_ <= '9' && i <= (kMaxInt - 9) / 10);
-    if (c0_ != '.' && c0_ != 'e' && c0_ != 'E') {
+    } while (c0_ >= '0' && c0_ <= '9');
+    if (c0_ != '.' && c0_ != 'e' && c0_ != 'E' && digits < 10) {
       SkipWhitespace();
       return Handle<Smi>(Smi::FromInt((negative ? -i : i)), isolate());
     }