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 d7b28a28f36d90a8805351de093626f526fa7b1e..abb209666bb6a5a62f8c3f9acf7b00b4f921b458 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