Update NetLog to be thread safe.

chrome/browser/debugger/devtools_netlog_observer.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 "chrome/browser/debugger/devtools_netlog_observer.h"
 
 #include "base/string_util.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/common/resource_response.h"
 #include "net/base/load_flags.h"
@@ skipping 23 matching lines @@
   if (it != request_to_info_.end())
     return it->second;
   return NULL;
 }
 
 void DevToolsNetLogObserver::OnAddEntry(net::NetLog::EventType type,
                                         const base::TimeTicks& time,
                                         const net::NetLog::Source& source,
                                         net::NetLog::EventPhase phase,
                                         net::NetLog::EventParameters* params) {
+  // The events that the Observer is interested in only occur on the IO thread.
+  if (!BrowserThread::CurrentlyOn(BrowserThread::IO))
+    return;
+
   if (type == net::NetLog::TYPE_URL_REQUEST_START_JOB) {
     if (phase != net::NetLog::PHASE_BEGIN)
       return;
     int load_flags = static_cast<URLRequestStartEventParameters*>(params)->
         load_flags();
     if (!(load_flags & net::LOAD_REPORT_RAW_HEADERS))
       return;
     if (request_to_info_.size() > kMaxNumEntries) {
       LOG(WARNING) << "The raw headers observer url request count has grown "
                       "larger than expected, resetting";
@@ skipping 39 matching lines @@
     }
     default:
       break;
   }
 }
 
 void DevToolsNetLogObserver::Attach(IOThread* io_thread) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(!instance_);
 
-  instance_ = new DevToolsNetLogObserver(io_thread->globals()->net_log.get());
+  instance_ = new DevToolsNetLogObserver(io_thread->net_log());
 }
 
 void DevToolsNetLogObserver::Detach() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(instance_);
 
   delete instance_;
   instance_ = NULL;
 }
 
@@ skipping 10 matching lines @@
     return;
 
   uint32 source_id = request->net_log().source().id;
   DevToolsNetLogObserver* dev_tools_net_log_observer =
       DevToolsNetLogObserver::GetInstance();
   if (!dev_tools_net_log_observer)
     return;
   response->response_head.devtools_info =
       dev_tools_net_log_observer->GetResourceInfo(source_id);
 }