No Easy unlock if bluetooth is not available.

chrome/browser/signin/easy_unlock_service.h

Index: chrome/browser/signin/easy_unlock_service.h
diff --git a/chrome/browser/signin/easy_unlock_service.h b/chrome/browser/signin/easy_unlock_service.h
index dda962f09e745f3d793809e646ff64810db19919..ad1270ee986afc04cfd9d97ee9fed1f1ff54f58e 100644
--- a/chrome/browser/signin/easy_unlock_service.h
+++ b/chrome/browser/signin/easy_unlock_service.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "components/keyed_service/core/keyed_service.h"
@@ -36,13 +37,30 @@ class EasyUnlockService : public KeyedService {
   bool IsAllowed();
 
  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();
+
   Profile* profile_;
   PrefChangeRegistrar registrar_;
+  scoped_ptr<BluetoothDetector> bluetooth_detector_;
   base::WeakPtrFactory<EasyUnlockService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockService);