Assert we do not leak requests for the system and safe browsing contexts.

chrome/browser/safe_browsing/safe_browsing_service.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/safe_browsing/safe_browsing_service.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 625 matching lines @@
   // |system_url_request_context_getter| may be NULL during tests.
   if (system_url_request_context_getter)
     url_request_context_->CopyFrom(
         system_url_request_context_getter->GetURLRequestContext());
   url_request_context_->set_cookie_store(cookie_store);
 }
 
 void SafeBrowsingService::DestroyURLRequestContextOnIOThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
+  url_request_context_->AssertNoURLRequests();
+
   // Need to do the CheckForLeaks on IOThread instead of in ShutDown where
   // url_request_context_getter_ is cleared,  since the URLRequestContextGetter
   // will PostTask to IOTread to delete itself.
   using base::debug::LeakTracker;
   LeakTracker<SafeBrowsingURLRequestContextGetter>::CheckForLeaks();
 
   DCHECK(url_request_context_.get());
   url_request_context_ = NULL;
 }
 
@@ skipping 804 matching lines @@
     Stop();
 
   if (csd_service_.get())
     csd_service_->SetEnabledAndRefreshState(enable);
   if (download_service_.get()) {
     download_service_->SetEnabled(
         enable && !CommandLine::ForCurrentProcess()->HasSwitch(
             switches::kDisableImprovedDownloadProtection));
   }
 }