Make SystemMonitor not a Singleton and move it out of base

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 296 matching lines @@
         'sys_info_freebsd.cc',
         'sys_info_linux.cc',
         'sys_info_mac.cc',
         'sys_info_openbsd.cc',
         'sys_info_posix.cc',
         'sys_info_win.cc',
         'sys_string_conversions.h',
         'sys_string_conversions_linux.cc',
         'sys_string_conversions_mac.mm',
         'sys_string_conversions_win.cc',
-        'system_monitor.cc',
-        'system_monitor.h',
-        'system_monitor_posix.cc',
-        'system_monitor_win.cc',
         'task.h',
         'thread.cc',
         'thread.h',
         'thread_collision_warner.cc',
         'thread_collision_warner.h',
         'thread_local.h',
         'thread_local_posix.cc',
         'thread_local_storage.h',
         'thread_local_storage_posix.cc',
         'thread_local_storage_win.cc',
@@ skipping 334 matching lines @@
         'simple_thread_unittest.cc',
         'singleton_unittest.cc',
         'stack_container_unittest.cc',
         'stats_table_unittest.cc',
         'string_piece_unittest.cc',
         'string_tokenizer_unittest.cc',
         'string_util_unittest.cc',
         'sys_info_unittest.cc',
         'sys_string_conversions_mac_unittest.mm',
         'sys_string_conversions_unittest.cc',
-        'system_monitor_unittest.cc',
         'task_unittest.cc',
         'thread_collision_warner_unittest.cc',
         'thread_local_storage_unittest.cc',
         'thread_local_unittest.cc',
         'thread_unittest.cc',
         'time_unittest.cc',
         'time_win_unittest.cc',
         'timer_unittest.cc',
         'tracked_objects_unittest.cc',
         'tuple_unittest.cc',
@@ skipping 204 matching lines @@
       ],
     }],
   ],
 }
 
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