Hook up AppLifeTimeManager::Observer to turn off discoverability for Smart Lock.

chrome/browser/signin/easy_unlock_service.cc

 // Copyright 2014 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 "chrome/browser/signin/easy_unlock_service.h"
 
 #include "apps/app_lifetime_monitor.h"
 #include "apps/app_lifetime_monitor_factory.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 72 matching lines @@
       proximity_auth::switches::kDisableEasyUnlock);
 }
 
 class EasyUnlockService::BluetoothDetector
     : public device::BluetoothAdapter::Observer,
       public apps::AppLifetimeMonitor::Observer {
  public:
   explicit BluetoothDetector(EasyUnlockService* service)
       : service_(service),
         weak_ptr_factory_(this) {
+    apps::AppLifetimeMonitorFactory::GetForProfile(service_->profile())
+        ->AddObserver(this);
   }
 
   ~BluetoothDetector() override {
     if (adapter_.get())
       adapter_->RemoveObserver(this);
+    apps::AppLifetimeMonitorFactory::GetForProfile(service_->profile())
+        ->RemoveObserver(this);
   }
 
   void Initialize() {
     if (!device::BluetoothAdapterFactory::IsBluetoothAdapterAvailable())
       return;
 
     device::BluetoothAdapterFactory::GetAdapter(
         base::Bind(&BluetoothDetector::OnAdapterInitialized,
                    weak_ptr_factory_.GetWeakPtr()));
   }
@@ skipping 687 matching lines @@
 
   // TODO(tbarzic): Set check_private_key only if previous sign-in attempt
   // failed.
   EasyUnlockTpmKeyManagerFactory::GetInstance()->Get(profile_)
       ->PrepareTpmKey(true /* check_private_key */,
                       base::Closure());
 #endif  // defined(OS_CHROMEOS)
 
   tpm_key_checked_ = true;
 }