Fix case where backup socket jobs ignored the socket limits....

net/socket/client_socket_pool_base.cc

 // 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.
 
 #include "net/socket/client_socket_pool_base.h"
 
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
 #include "base/message_loop.h"
 #include "base/stats_counters.h"
@@ skipping 280 matching lines @@
     const std::string& group_name) {
   CHECK(ContainsKey(group_map_, group_name));
 
   Group& group = group_map_[group_name];
 
   CHECK(group.backup_task);
   group.backup_task = NULL;
 
   CHECK(group.backup_job);
 
-  // If our backup job is waiting on DNS, just reset the timer.
+  // If our backup job is waiting on DNS, or if we can't create any sockets
+  // right now due to limits, just reset the timer.
   CHECK(group.jobs.size());
-  if ((*group.jobs.begin())->GetLoadState() == LOAD_STATE_RESOLVING_HOST) {
+  if (ReachedMaxSocketsLimit() ||
+      !group.HasAvailableSocketSlot(max_sockets_per_group_) ||
+      (*group.jobs.begin())->GetLoadState() == LOAD_STATE_RESOLVING_HOST) {
     group.backup_job->net_log().EndEvent(
         NetLog::TYPE_SOCKET_BACKUP_TIMER_EXTENDED);
     StartBackupSocketTimer(group_name);
     return;
   }
 
   group.backup_job->net_log().AddEvent(NetLog::TYPE_SOCKET_BACKUP_CREATED);
   SIMPLE_STATS_COUNTER("socket.backup_created");
   int rv = group.backup_job->Connect();
   connecting_socket_count_++;
@@ skipping 402 matching lines @@
     } else {
       ++i;
     }
   }
 }
 
 bool ClientSocketPoolBaseHelper::ReachedMaxSocketsLimit() const {
   // Each connecting socket will eventually connect and be handed out.
   int total = handed_out_socket_count_ + connecting_socket_count_;
   DCHECK_LE(total, max_sockets_);
-  return total == max_sockets_;
+  if (total < max_sockets_)
+    return false;
+  LOG(WARNING) << "ReachedMaxSocketsLimit: " << total << "/" << max_sockets_;
+  return true;
 }
 
 }  // namespace internal
 
 }  // namespace net