[Chromoting] Use ProcessStatsSender in DesktopSessionAgent (desktop process)

remoting/host/process_stats_sender.cc

 // Copyright 2017 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 "remoting/host/process_stats_sender.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "remoting/host/process_stats_agent.h"
 #include "remoting/host/process_stats_util.h"
 
 namespace remoting {
 
 ProcessStatsSender::ProcessStatsSender(
     protocol::ProcessStatsStub* host_stats_stub,
     base::TimeDelta interval,
     std::initializer_list<ProcessStatsAgent*> agents)
     : host_stats_stub_(host_stats_stub),
       agents_(agents),
       thread_checker_() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(host_stats_stub_);
-  DCHECK(!interval.is_zero());
+  DCHECK(interval > base::TimeDelta());
   DCHECK(!agents_.empty());
 
   timer_.Start(FROM_HERE, interval, this, &ProcessStatsSender::ReportUsage);
 }
 
 ProcessStatsSender::~ProcessStatsSender() {
   DCHECK(thread_checker_.CalledOnValidThread());
   timer_.Stop();
 }
 
 void ProcessStatsSender::ReportUsage() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   std::vector<protocol::ProcessResourceUsage> usages;
   for (auto* const agent : agents_) {
     DCHECK(agent);
     protocol::ProcessResourceUsage usage = agent->GetResourceUsage();
     if (!IsEmptyProcessResourceUsage(usage)) {
       usages.push_back(std::move(usage));
     }
   }
 
   host_stats_stub_->OnProcessStats(AggregateProcessResourceUsage(usages));
 }
 
 }  // namespace remoting