Remove the fd overload of BlockingSocket::BlockingSocket()

Summary: It's not needed

Reviewed By: yfeldblum

Differential Revision: D13993615

fbshipit-source-id: 7e53224d39502b96e13bff352dab778df4782a1c

folly/io/async/test/BlockingSocket.h

@@ -27,8 +27,6 @@ class BlockingSocket : public folly::AsyncSocket::ConnectCallback,
  public:
   explicit BlockingSocket(folly::NetworkSocket fd)
       : sock_(new folly::AsyncSocket(&eventBase_, fd)) {}
-  explicit BlockingSocket(int fd)
-      : sock_(new folly::AsyncSocket(&eventBase_, fd)) {}
 
   BlockingSocket(
       folly::SocketAddress address,