Revert 85732 (broke build) - Move SystemMonitor to base/.

content/common/hi_res_timer_manager_win.cc

Index: content/common/hi_res_timer_manager_win.cc
===================================================================
--- content/common/hi_res_timer_manager_win.cc	(revision 85733)
+++ content/common/hi_res_timer_manager_win.cc	(working copy)
@@ -8,13 +8,13 @@
 
 HighResolutionTimerManager::HighResolutionTimerManager()
     : hi_res_clock_available_(false) {
-  base::SystemMonitor* system_monitor = base::SystemMonitor::Get();
+  ui::SystemMonitor* system_monitor = ui::SystemMonitor::Get();
   system_monitor->AddObserver(this);
   UseHiResClock(!system_monitor->BatteryPower());
 }
 
 HighResolutionTimerManager::~HighResolutionTimerManager() {
-  base::SystemMonitor::Get()->RemoveObserver(this);
+  ui::SystemMonitor::Get()->RemoveObserver(this);
   UseHiResClock(false);
 }