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

remoting/host/current_process_stats_agent.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/current_process_stats_agent.h"
-
-#include "base/process/process_metrics.h"
-
-namespace remoting {
-
-CurrentProcessStatsAgent::CurrentProcessStatsAgent(
-    const std::string& process_name)
-    : process_name_(process_name),
-      metrics_(base::ProcessMetrics::CreateCurrentProcessMetrics()) {}
-
-CurrentProcessStatsAgent::~CurrentProcessStatsAgent() = default;
-
-protocol::ProcessResourceUsage CurrentProcessStatsAgent::GetResourceUsage() {
-  protocol::ProcessResourceUsage current;
-  current.set_process_name(process_name_);
-  current.set_processor_usage(metrics_->GetPlatformIndependentCPUUsage());
-  current.set_working_set_size(metrics_->GetWorkingSetSize());
-  current.set_pagefile_size(metrics_->GetPagefileUsage());
-  return current;
-}
-
-}  // namespace remoting