One missed #ifdef and some comments cleaned up.

net/socket/tcp_socket_libevent.cc

Index: net/socket/tcp_socket_libevent.cc
diff --git a/net/socket/tcp_socket_libevent.cc b/net/socket/tcp_socket_libevent.cc
index 426c8b0dd3505e99acc51920ae40b4511c87bc03..0e409af09b1f56420688d1a0925b3b0004be7ef6 100644
--- a/net/socket/tcp_socket_libevent.cc
+++ b/net/socket/tcp_socket_libevent.cc
@@ -547,13 +547,13 @@ int TCPSocketLibevent::TcpFastOpenWrite(
     return rv;
 
   int flags = 0x20000000;  // Magic flag to enable TCP_FASTOPEN.
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_ANDROID)
   // sendto() will fail with EPIPE when the system doesn't support TCP Fast
   // Open. Theoretically that shouldn't happen since the caller should check
   // for system support on startup, but users may dynamically disable TCP Fast
   // Open via sysctl.
   flags |= MSG_NOSIGNAL;
-#endif // defined(OS_LINUX)
+#endif // defined(OS_LINUX) || defined(OS_ANDROID)
   rv = HANDLE_EINTR(sendto(socket_->socket_fd(),
                            buf->data(),
                            buf_len,