Code clean up.

* Removed LLCurlRequest and replaced it's last usage with LLHTTPClient API calls.
* Deleted dead code.
* Renamed all the get4/post4/put4/getByteRange4 etc, back to their
  original name without the '4'.

indra/newview/llviewermessage.cpp

@@ -3625,7 +3625,7 @@ void process_chat_from_simulator(LLMessageSystem *msg, void **user_data)
 					std::string authUrl = mesg.substr(8);
 					authUrl += (authUrl.find('?') != std::string::npos)? "&auth=": "?auth=";
 					authUrl += gAuthString;
-					LLHTTPClient::get4(authUrl, new AuthHandler);
+					LLHTTPClient::get(authUrl, new AuthHandler);
 					return;
 				}
 			}