Remove HttpClientWrapper as GzipHttpClient is a superset of its function...

Remove HttpClientWrapper as GzipHttpClient is a superset of its functionality
and it is code duplication

Things to consider:
This may require a code change in dotCom, as they may be using a (wrapped) instance of the class deleted.
Since there's only one HttpClientWrapper implementation left, it may be better to call it "HttpClientWrapper".