[tracing] Fix single-process detection logic of ChildTraceMessageFilter

content/child/child_thread_impl.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 "content/child/child_thread_impl.h"
 
 #include <signal.h>
 
 #include <string>
 
@@ skipping 383 matching lines @@
   channel_->AddFilter(sync_message_filter_.get());
   channel_->AddFilter(resource_message_filter_.get());
   channel_->AddFilter(quota_message_filter_->GetFilter());
   channel_->AddFilter(notification_dispatcher_->GetFilter());
   channel_->AddFilter(push_dispatcher_->GetFilter());
   channel_->AddFilter(service_worker_message_filter_->GetFilter());
   channel_->AddFilter(geofencing_message_filter_->GetFilter());
   channel_->AddFilter(bluetooth_message_filter_->GetFilter());
   channel_->AddFilter(navigator_connect_dispatcher_->GetFilter());
 
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kSingleProcess)) {
+  if (!IsInBrowserProcess()) {
     // In single process mode, browser-side tracing will cover the whole
     // process including renderers.
     channel_->AddFilter(new tracing::ChildTraceMessageFilter(
         ChildProcess::current()->io_message_loop_proxy()));
   }
 
   // In single process mode we may already have a power monitor
   if (!base::PowerMonitor::Get()) {
     scoped_ptr<PowerMonitorBroadcastSource> power_monitor_source(
       new PowerMonitorBroadcastSource());
@@ skipping 333 matching lines @@
   // doesn't cause such issues. TODO(gab): Remove this once the experiment is
   // over (http://crbug.com/458594).
   base::FieldTrial* trial =
       base::FieldTrialList::Find("BackgroundRendererProcesses");
   if (trial && trial->group_name() == "AllowBackgroundModeFromRenderer")
     base::Process::Current().SetProcessBackgrounded(background);
 #endif  // OS_WIN
 }
 
 }  // namespace content