Add SOCKS4 and SOCKS5 fuzzers.

net/socket/socks_client_socket.cc

Index: net/socket/socks_client_socket.cc
diff --git a/net/socket/socks_client_socket.cc b/net/socket/socks_client_socket.cc
index 0f6e925596e9ef4bae8b8c3db338a4bedc9c6c62..b212f6284c10d1b9674fdcc5a3566320d7f80fa7 100644
--- a/net/socket/socks_client_socket.cc
+++ b/net/socket/socks_client_socket.cc
@@ -417,7 +417,7 @@ int SOCKSClientSocket::DoHandshakeReadComplete(int result) {
       reinterpret_cast<const SOCKS4ServerResponse*>(buffer_.data());
 
   if (response->reserved_null != 0x00) {
-    LOG(ERROR) << "Unknown response from SOCKS server.";
+    DVLOG(1) << "Unknown response from SOCKS server.";
     return ERR_SOCKS_CONNECTION_FAILED;
   }
 
@@ -426,18 +426,18 @@ int SOCKSClientSocket::DoHandshakeReadComplete(int result) {
       completed_handshake_ = true;
       return OK;
     case kServerResponseRejected:
-      LOG(ERROR) << "SOCKS request rejected or failed";
+      DVLOG(1) << "SOCKS request rejected or failed";
       return ERR_SOCKS_CONNECTION_FAILED;
     case kServerResponseNotReachable:
-      LOG(ERROR) << "SOCKS request failed because client is not running "
-                 << "identd (or not reachable from the server)";
+      DVLOG(1) << "SOCKS request failed because client is not running "
+               << "identd (or not reachable from the server)";
       return ERR_SOCKS_CONNECTION_HOST_UNREACHABLE;
     case kServerResponseMismatchedUserId:
-      LOG(ERROR) << "SOCKS request failed because client's identd could "
-                 << "not confirm the user ID string in the request";
+      DVLOG(1) << "SOCKS request failed because client's identd could "
+               << "not confirm the user ID string in the request";
       return ERR_SOCKS_CONNECTION_FAILED;
     default:
-      LOG(ERROR) << "SOCKS server sent unknown response";
+      DVLOG(1) << "SOCKS server sent unknown response";
       return ERR_SOCKS_CONNECTION_FAILED;
   }