Revert of [Chromoting] Retrieve process resource usage (ProcessStats) and its tests

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) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(host_stats_stub_);
-  DCHECK(!interval.is_zero());
-  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