Add a fuzzer for HttpProxyClientSocket.

net/socket/fuzzed_socket.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/socket/fuzzed_socket.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 135 matching lines @@
 
 void FuzzedSocket::Disconnect() {
   net_error_ = ERR_CONNECTION_CLOSED;
   weak_factory_.InvalidateWeakPtrs();
   read_pending_ = false;
   write_pending_ = false;
   error_pending_ = false;
 }
 
 bool FuzzedSocket::IsConnected() const {
-  return net_error_ != OK && !error_pending_;
+  return net_error_ == OK && !error_pending_;
 }
 
 bool FuzzedSocket::IsConnectedAndIdle() const {
   return IsConnected();
 }
 
 int FuzzedSocket::GetPeerAddress(IPEndPoint* address) const {
   if (!IsConnected())
     return ERR_SOCKET_NOT_CONNECTED;
   *address = IPEndPoint(IPAddress(127, 0, 0, 1), 80);
@@ skipping 76 matching lines @@
   write_pending_ = false;
   if (result <= 0) {
     error_pending_ = false;
   } else {
     total_bytes_written_ += result;
   }
   callback.Run(result);
 }
 
 }  // namespace net