Implement BluetoothGattNotifySession::Stop on Android, 2nd attempt

device/bluetooth/test/mock_bluetooth_gatt_notify_session.h

Index: device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
diff --git a/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h b/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
index 9d70333aa2f3ebe136c98b28bbbbc96215481668..a00ceccd6b36b6a0824fe728583de38f951de800 100644
--- a/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
+++ b/device/bluetooth/test/mock_bluetooth_gatt_notify_session.h
@@ -23,10 +23,9 @@ class MockBluetoothGattCharacteristic;
 class MockBluetoothGattNotifySession : public BluetoothGattNotifySession {
  public:
   explicit MockBluetoothGattNotifySession(
-      const std::string& characteristic_identifier);
+      base::WeakPtr<BluetoothRemoteGattCharacteristic> characteristic);
   virtual ~MockBluetoothGattNotifySession();
 
-  MOCK_CONST_METHOD0(GetCharacteristicIdentifier, std::string());
   MOCK_METHOD0(IsActive, bool());
   MOCK_METHOD1(Stop, void(const base::Closure&));