Fix preconnect crash when we hit max socket limit.

net/base/net_error_list.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate enum.
 
 // This file contains the list of network errors.
 
 //
@@ skipping 173 matching lines @@
 // NPN protocol support. However, after doing the actual handshake, our
 // prediction turned out to be incorrect so we sent a request in the wrong
 // protocol.
 NET_ERROR(SSL_SNAP_START_NPN_MISPREDICTION, -131)
 
 // We detected an ESET product intercepting our HTTPS connections. Since these
 // products are False Start intolerant, we return this error so that we can
 // give the user a helpful error message rather than have the connection hang.
 NET_ERROR(ESET_ANTI_VIRUS_SSL_INTERCEPTION, -132)
 
-// Missing -133. Feel free to reuse in the future.
+// We've hit the max socket limit for the socket pool while preconnecting.  We
+// don't bother trying to preconnect more sockets.
+NET_ERROR(PRECONNECT_MAX_SOCKET_LIMIT, -133)
 
 // The permission to use the SSL client certificate's private key was denied.
 NET_ERROR(SSL_CLIENT_AUTH_PRIVATE_KEY_ACCESS_DENIED, -134)
 
 // The SSL client certificate has no private key.
 NET_ERROR(SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY, -135)
 
 // The certificate presented by the HTTPS Proxy was invalid.
 NET_ERROR(PROXY_CERTIFICATE_INVALID, -136)
 
@@ skipping 297 matching lines @@
 // Import failed - certificate already exists in database.
 // Note it's a little weird this is an error but reimporting a PKCS12 is ok
 // (no-op).  That's how Mozilla does it, though.
 NET_ERROR(IMPORT_CERT_ALREADY_EXISTS, -704)
 
 // CA import failed due to some other error.
 NET_ERROR(IMPORT_CA_CERT_FAILED, -705)
 
 // Server certificate import failed due to some internal error.
 NET_ERROR(IMPORT_SERVER_CERT_FAILED, -706)