Use uint32_t to hold return values from ERR_get_error() and ERR_peek_error().

net/quic/crypto/aead_base_decrypter_openssl.cc

Index: net/quic/crypto/aead_base_decrypter_openssl.cc
diff --git a/net/quic/crypto/aead_base_decrypter_openssl.cc b/net/quic/crypto/aead_base_decrypter_openssl.cc
index 23116408fa787dff2360bf2293ae0c62da29b150..7929388114beb2f26b0e2e1b20d666429e8fe2ee 100644
--- a/net/quic/crypto/aead_base_decrypter_openssl.cc
+++ b/net/quic/crypto/aead_base_decrypter_openssl.cc
@@ -26,7 +26,7 @@ void DLogOpenSslErrors() {
 #ifdef NDEBUG
   ClearOpenSslErrors();
 #else
-  while (unsigned long error = ERR_get_error()) {
+  while (uint32_t error = ERR_get_error()) {
     char buf[120];
     ERR_error_string_n(error, buf, arraysize(buf));
     DLOG(ERROR) << "OpenSSL error: " << buf;