[Clean-up] Remove NetworkStats code, which has been dead code since July 2014.

chrome/browser/metrics/network_stats_uploader.cc

-// Copyright 2014 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 "chrome/browser/metrics/network_stats_uploader.h"
-
-#include "chrome/browser/browser_process.h"
-#include "chrome/browser/metrics/time_ticks_experiment_win.h"
-#include "chrome/browser/net/network_stats.h"
-#include "chrome/common/net/test_server_locations.h"
-
-#if !defined(OS_POSIX)
-#include "chrome/installer/util/browser_distribution.h"
-#endif
-
-NetworkStatsUploader::NetworkStatsUploader() {
-#if defined(OS_POSIX)
-  network_stats_server_ = chrome_common_net::kEchoTestServerLocation;
-#else
-  BrowserDistribution* dist = BrowserDistribution::GetDistribution();
-  network_stats_server_ = dist->GetNetworkStatsServer();
-#endif
-}
-
-NetworkStatsUploader::~NetworkStatsUploader() {
-}
-
-void NetworkStatsUploader::CollectAndReportNetworkStats() {
-  IOThread* io_thread = g_browser_process->io_thread();
-  if (!io_thread)
-    return;
-
-  chrome_browser_net::CollectNetworkStats(network_stats_server_, io_thread);
-#if defined(OS_WIN)
-  chrome::CollectTimeTicksStats();
-#endif
-}