net: a weak DH key is not a certificate error.

net/base/net_errors.h

Index: net/base/net_errors.h
diff --git a/net/base/net_errors.h b/net/base/net_errors.h
index c8742a8110df194d01666ebd46d20e8403c121c1..2c513612209f7c2eb08dc6c249160da506664b6f 100644
--- a/net/base/net_errors.h
+++ b/net/base/net_errors.h
@@ -36,8 +36,9 @@ NET_EXPORT const char* ErrorToString(int error);
 inline bool IsCertificateError(int error) {
   // Certificate errors are negative integers from net::ERR_CERT_BEGIN
   // (inclusive) to net::ERR_CERT_END (exclusive) in *decreasing* order.
+  // ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN is currently an exception to this
+  // rule.
   return (error <= ERR_CERT_BEGIN && error > ERR_CERT_END) ||
-         (error == ERR_SSL_WEAK_SERVER_EPHEMERAL_DH_KEY) ||
          (error == ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN);
 }