No Easy unlock if bluetooth is not available.

chrome/browser/signin/easy_unlock_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 60 matching lines @@
   void ResetTurnOffFlow();
 
   void AddObserver(EasyUnlockServiceObserver* observer);
   void RemoveObserver(EasyUnlockServiceObserver* observer);
 
   TurnOffFlowStatus turn_off_flow_status() const {
     return turn_off_flow_status_;
   }
 
  private:
+  // A class to detect whether a bluetooth adapter is present.
+  class BluetoothDetector;
+
+  // Initializes the service after ExtensionService is ready.
   void Initialize();
+
+  // Loads the Easy unlock component app.
   void LoadApp();
+
+  // Unloads the Easy unlock component app.
   void UnloadApp();
+
+  // Checks whether Easy unlock should be running and updates app state.
+  void UpdateAppState();
+
+  // Callback when the controlling pref changes.
   void OnPrefsChanged();
 
+  // Callback when Bluetooth adapter present state changes.
+  void OnBluetoothAdapterPresentChanged();
+
+  // Sets the new turn-off flow status.
   void SetTurnOffFlowStatus(TurnOffFlowStatus status);
+
+  // Callback invoked when turn off flow has finished.
   void OnTurnOffFlowFinished(bool success);
 
   Profile* profile_;
   PrefChangeRegistrar registrar_;
+  scoped_ptr<BluetoothDetector> bluetooth_detector_;
   // Created lazily in |GetScreenlockStateHandler|.
   scoped_ptr<EasyUnlockScreenlockStateHandler> screenlock_state_handler_;
 
   TurnOffFlowStatus turn_off_flow_status_;
   scoped_ptr<EasyUnlockToggleFlow> turn_off_flow_;
   ObserverList<EasyUnlockServiceObserver> observers_;
 
   base::WeakPtrFactory<EasyUnlockService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_