Adds some debugging code in hopes of tracking down a...

chrome/browser/renderer_host/render_process_host.cc

 // Copyright (c) 2009 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 "chrome/browser/renderer_host/render_process_host.h"
 
 #include "base/rand_util.h"
 #include "base/sys_info.h"
 #include "chrome/browser/child_process_security_policy.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 67 matching lines @@
 
 }  // namespace
 
 bool RenderProcessHost::run_renderer_in_process_ = false;
 
 RenderProcessHost::RenderProcessHost(Profile* profile)
     : max_page_id_(-1),
       pid_(-1),
       profile_(profile),
       sudden_termination_allowed_(true) {
+  all_hosts.set_check_on_null_data(true);
 }
 
 RenderProcessHost::~RenderProcessHost() {
 }
 
 void RenderProcessHost::Attach(IPC::Channel::Listener* listener,
                                int routing_id) {
   listeners_.AddWithID(listener, routing_id);
 }
 
@@ skipping 88 matching lines @@
   }
 
   pid_ = pid;
   all_hosts.AddWithID(this, pid);
 }
 
 void RenderProcessHost::RemoveFromList() {
   if (all_hosts.Lookup(pid_))
     all_hosts.Remove(pid_);
 }