net: retain leading zero bytes in X.509 serial numbers.

net/base/x509_certificate_win.cc

Index: net/base/x509_certificate_win.cc
diff --git a/net/base/x509_certificate_win.cc b/net/base/x509_certificate_win.cc
index 5c53a15bb55e39144d80d3fff9a6995a1a3074fa..a087799d02b3502af6cd808e557a52a84388a6de 100644
--- a/net/base/x509_certificate_win.cc
+++ b/net/base/x509_certificate_win.cc
@@ -548,9 +548,6 @@ void X509Certificate::Initialize() {
     serial_bytes[i] = serial->pbData[serial->cbData - i - 1];
   serial_number_ = std::string(
       reinterpret_cast<char*>(serial_bytes.get()), serial->cbData);
-  // Remove leading zeros.
-  while (serial_number_.size() > 1 && serial_number_[0] == 0)
-    serial_number_ = serial_number_.substr(1, serial_number_.size() - 1);
 }
 
 // IsIssuedByKnownRoot returns true if the given chain is rooted at a root CA