Make SystemMonitor not a Singleton and move it out of base

chrome/nacl/nacl_main.cc

Index: chrome/nacl/nacl_main.cc
diff --git a/chrome/nacl/nacl_main.cc b/chrome/nacl/nacl_main.cc
index 05164956d4f6f560afb97635646ce000804a252f..5271cf4b1837d094c237e044dca42840b0d2424e 100644
--- a/chrome/nacl/nacl_main.cc
+++ b/chrome/nacl/nacl_main.cc
@@ -10,10 +10,11 @@
 #include "sandbox/src/sandbox.h"
 #endif
 
+#include "app/hi_res_timer_manager.h"
+#include "app/system_monitor.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
-#include "base/system_monitor.h"
 #include "chrome/common/child_process.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
@@ -28,8 +29,8 @@ int NaClMain(const MainFunctionParams& parameters) {
   std::wstring app_name = chrome::kBrowserAppName;
   PlatformThread::SetName(WideToASCII(app_name + L"_NaClMain").c_str());
 
-  // Initialize the SystemMonitor
-  base::SystemMonitor::Start();
+  SystemMonitor system_monitor;
+  HighResolutionTimerManager hi_res_timer_manager;
 
 #if defined(OS_WIN)
   const CommandLine& parsed_command_line = parameters.command_line_;