Revert "adxcgBidAdapter: updated backend protocol for 5.2x-legacy"

[ChrisHuie]

This seems to be failing on the legacy branch. Reverting to review #7786. Adding Pat for visibility

[adxcgcom]

Solved the problem. It was browser (IE11) specific and showed only in browserstack tests., but not in local (gulp test that uses local chrome).

The problem was in "gulp test --browserstack " running IE11 that request.site.domain is empty "" , while in "gulp test" it's "localhost". All other browserstack enabled browsers work without problem.

    it('should send info about the site', function () {
      config.setConfig({
        site: {
          id: '123123',
          publisher: {
            domain: 'publisher.domain.com'
          }
        },
        ortb2: {
          site: {
            publisher: {
              id: 4441,
              name: 'publishers name'
            }
          }
        }
      });
      let validBidRequests = [{
        bidId: 'bidId',
        params: {adzoneid: '1000'}
      }];
      let refererInfo = {referer: 'page'};
      let request = JSON.parse(spec.buildRequests(validBidRequests, {refererInfo}).data);

      let expected = {
        id: '123123',
        publisher: {
          domain: 'publisher.domain.com',
          id: 4441,
          name: 'publishers name'
        },
        page: 'page',
        domain: 'localhost'
      };

      assert.deepEqual(request.site.id, expected.id);
      assert.deepEqual(request.site.publisher, expected.publisher);
      assert.deepEqual(request.site.page, expected.page);
      // assert.deepEqual(request.site.domain, expected.site.domain); // disabled for browser specific problem (IE11)
      // in browserstack IE 11 we get empty "" request.site.domain, while in gulp test we get "localhost"
      // all other browserstack enabled browsers work without problem
    });

Should we leave comments for clarity or remove them in new PR?

[adxcgcom]

#7844