message: Fix failed UT in PROPRIETARY mode
  Fixed unused variable if PROPRIETARY policy mode enabled.
  Related-issues:
diff: @@ -1353,12 +1353,12 @@ TEST_F(PolicyHandlerTest, OnSnapshotCreated_UrlAdded) {
  EndpointUrls test_data;
  EndpointData data(kDummyData);
  test_data.push_back(data);
  - AppIdURL next_app_url = std::make_pair(0, 0);
  ApplicationSharedPtr mock_app;
  #ifdef PROPRIETARY_MODE
  ExtendedPolicyExpectations();
  #else
  + AppIdURL next_app_url = std::make_pair(0, 0);
  EXPECT_CALL(*mock_policy_manager_, GetUpdateUrls("0x07", _))
  .WillRepeatedly(SetArgReferee<1>(test_data));
  EXPECT_CALL(*mock_policy_manager_, GetNextUpdateUrl(_))
  