Fix DCHECK caused by Task Manager assuming all requests have a render view.

chrome/browser/task_manager/task_manager.cc

 // Copyright (c) 2011 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/task_manager/task_manager.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/compiler_specific.h"
 #include "base/i18n/number_formatting.h"
@@ skipping 872 matching lines @@
 void TaskManagerModel::OnJobRedirect(net::URLRequestJob* job,
                                      const GURL& location,
                                      int status_code) {
 }
 
 void TaskManagerModel::OnBytesRead(net::URLRequestJob* job, const char* buf,
                                    int byte_count) {
   int render_process_host_child_id = -1, routing_id = -1;
   if (!ResourceDispatcherHost::RenderViewForRequest(job->request(),
                                                &render_process_host_child_id,
                                                &routing_id)) {

[Nico, 2011/01/19 16:39:36]

Add a comment describing when this happens.

-    NOTREACHED();
+    return;
   }
 
   // This happens in the IO thread, post it to the UI thread.
   int origin_child_id =
       chrome_browser_net::GetOriginProcessUniqueIDForRequest(job->request());
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(
           this,
           &TaskManagerModel::BytesRead,
@@ skipping 123 matching lines @@
   MetricsMap::const_iterator iter = metrics_map_.find(handle);
   if (iter == metrics_map_.end())
     return false;
 
   if (!iter->second->GetMemoryBytes(&usage->first, &usage->second))
     return false;
 
   memory_usage_map_.insert(std::make_pair(handle, *usage));
   return true;
 }