Revert 255262 "Migrate chrome.bluetooth API backend to use devic..."

trunk/src/device/bluetooth/bluetooth_discovery_session.h

Index: trunk/src/device/bluetooth/bluetooth_discovery_session.h
===================================================================
--- trunk/src/device/bluetooth/bluetooth_discovery_session.h	(revision 255369)
+++ trunk/src/device/bluetooth/bluetooth_discovery_session.h	(working copy)
@@ -58,12 +58,10 @@
                     const ErrorCallback& error_callback);
 
  protected:
-  BluetoothDiscoverySession();  // Called by mock.
-
- private:
   friend class BluetoothAdapter;
-  explicit BluetoothDiscoverySession(scoped_refptr<BluetoothAdapter> adapter);
+  explicit BluetoothDiscoverySession(BluetoothAdapter* adapter);
 
+ private:
   // Internal callback invoked when a call to Stop has succeeded.
   void OnStop(const base::Closure& callback);