Remove the fd overloads of AsyncSocket get & detach fd

Summary: They are dead.

Reviewed By: yfeldblum

Differential Revision: D14191874

fbshipit-source-id: 80e6b9c51aa7d29ccc01148ccb1fd1014688c764

folly/io/async/AsyncSocket.h

@@ -339,10 +339,6 @@ class AsyncSocket : virtual public AsyncTransportWrapper {
   /**
    * Get the network socket used by the AsyncSocket.
    */
-  virtual int getFd(int /*breakAllTheThings*/) const {
-    return -1;
-  }
-
   virtual NetworkSocket getNetworkSocket() const {
     return fd_;
   }
@@ -361,10 +357,6 @@ class AsyncSocket : virtual public AsyncTransportWrapper {
    * Returns the file descriptor.  The caller assumes ownership of the
    * descriptor, and it will not be closed when the AsyncSocket is destroyed.
    */
-  virtual int detachFd(int) {
-    return detachNetworkSocket().toFd();
-  }
-
   virtual NetworkSocket detachNetworkSocket();
 
   /**