One minor cleanup for JobController::EstimateMemoryUsage()

net/http/http_stream_factory_impl_job_controller.cc

 // Copyright (c) 2016 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 "net/http/http_stream_factory_impl_job_controller.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "base/trace_event/memory_usage_estimator.h"
 #include "base/values.h"
 #include "net/base/host_mapping_rules.h"
 #include "net/base/proxy_delegate.h"
 #include "net/http/bidirectional_stream_impl.h"
 #include "net/http/transport_security_state.h"
 #include "net/log/net_log_capture_mode.h"
 #include "net/log/net_log_event_type.h"
 #include "net/log/net_log_source.h"
 #include "net/log/net_log_with_source.h"
 #include "net/proxy/proxy_server.h"
@@ skipping 646 matching lines @@
 
 bool HttpStreamFactoryImpl::JobController::HasPendingMainJob() const {
   return main_job_.get() != nullptr;
 }
 
 bool HttpStreamFactoryImpl::JobController::HasPendingAltJob() const {
   return alternative_job_.get() != nullptr;
 }
 
 size_t HttpStreamFactoryImpl::JobController::EstimateMemoryUsage() const {
-  size_t estimated_size = 0;
-  if (main_job_)
-    estimated_size += main_job_->EstimateMemoryUsage();
-  if (alternative_job_)
-    estimated_size += alternative_job_->EstimateMemoryUsage();
-  return estimated_size;
+  return base::trace_event::EstimateMemoryUsage(main_job_) +
+         base::trace_event::EstimateMemoryUsage(alternative_job_);
 }
 
 WebSocketHandshakeStreamBase::CreateHelper* HttpStreamFactoryImpl::
     JobController::websocket_handshake_stream_create_helper() {
   DCHECK(request_);
   return request_->websocket_handshake_stream_create_helper();
 }
 
 void HttpStreamFactoryImpl::JobController::CreateJobs(
     const HttpRequestInfo& request_info,
@@ skipping 453 matching lines @@
     return;
   DCHECK(alternative_job_->alternative_proxy_server().is_valid());
   alternative_job_->Start(request_->stream_type());
 }
 
 bool HttpStreamFactoryImpl::JobController::IsJobOrphaned(Job* job) const {
   return !request_ || (job_bound_ && bound_job_ != job);
 }
 
 }  // namespace net