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

app/system_monitor_mac.mm

-// Copyright (c) 2010 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/system_monitor.h"
-
-#import <AppKit/AppKit.h>
-
-@interface SystemMonitorBridge : NSObject {
- @private
-  SystemMonitor* systemMonitor_;  // weak
-}
-
-- (id)initWithSystemMonitor:(SystemMonitor*)monitor;
-- (void)computerDidSleep:(NSNotification*)notification;
-- (void)computerDidWake:(NSNotification*)notification;
-
-@end
-
-@implementation SystemMonitorBridge
-
-- (id)initWithSystemMonitor:(SystemMonitor*)monitor {
-  self = [super init];
-  if (self) {
-    systemMonitor_ = monitor;
-
-    // See QA1340
-    // <http://developer.apple.com/library/mac/#qa/qa2004/qa1340.html> for more
-    // details.
-    [[[NSWorkspace sharedWorkspace] notificationCenter]
-        addObserver:self
-           selector:@selector(computerDidSleep:)
-               name:NSWorkspaceWillSleepNotification
-             object:nil];
-    [[[NSWorkspace sharedWorkspace] notificationCenter]
-        addObserver:self
-           selector:@selector(computerDidWake:)
-               name:NSWorkspaceDidWakeNotification
-             object:nil];
-  }
-  return self;
-}
-
-- (void)dealloc {
-  [[[NSWorkspace sharedWorkspace] notificationCenter]
-      removeObserver:self];
-  [super dealloc];
-}
-
-- (void)computerDidSleep:(NSNotification*)notification {
-  systemMonitor_->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
-}
-
-- (void)computerDidWake:(NSNotification*)notification {
-  systemMonitor_->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-}
-
-@end
-
-void SystemMonitor::PlatformInit() {
-  system_monitor_bridge_ =
-      [[SystemMonitorBridge alloc] initWithSystemMonitor:this];
-}
-
-void SystemMonitor::PlatformDestroy() {
-  [system_monitor_bridge_ release];
-}