Move SystemMonitor to src/chrome/common....

app/hi_res_timer_manager_posix.cc

-// Copyright (c) 2009 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 "app/hi_res_timer_manager.h"
-
-// On POSIX we don't need to do anything special with the system timer.
-
-HighResolutionTimerManager::HighResolutionTimerManager()
-    : hi_res_clock_used_(false) {
-}
-
-HighResolutionTimerManager::~HighResolutionTimerManager() {
-}
-
-void HighResolutionTimerManager::OnPowerStateChange(bool on_battery_power) {
-}
-
-void HighResolutionTimerManager::UseHiResClock(bool use) {
-}