Partially reland r131930. Only assert on system context leaks this time.

chrome/browser/io_thread.cc

 // Copyright (c) 2012 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/io_thread.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 447 matching lines @@
 void IOThread::CleanUp() {
   base::debug::LeakTracker<SafeBrowsingURLRequestContext>::CheckForLeaks();
 
   delete sdch_manager_;
   sdch_manager_ = NULL;
 
 #if defined(USE_NSS)
   net::ShutdownNSSHttpIO();
 #endif  // defined(USE_NSS)
 
+  globals_->system_request_context->AssertNoURLRequests();
+
   system_url_request_context_getter_ = NULL;
 
   // Release objects that the net::URLRequestContext could have been pointing
   // to.
 
   // This must be reset before the ChromeNetLog is destroyed.
   network_change_observer_.reset();
 
   system_proxy_config_service_.reset();
 
@@ skipping 119 matching lines @@
       new net::HttpNetworkLayer(
           new net::HttpNetworkSession(system_params)));
   globals_->system_ftp_transaction_factory.reset(
       new net::FtpNetworkLayer(globals_->host_resolver.get()));
   globals_->system_request_context =
       ConstructSystemRequestContext(globals_, net_log_);
 
   sdch_manager_->set_sdch_fetcher(
       new SdchDictionaryFetcher(system_url_request_context_getter_.get()));
 }