Move UnixDomainSocket to base namespace

content/common/send_zygote_child_ping_linux.cc

 // Copyright 2014 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 "content/public/common/send_zygote_child_ping_linux.h"
 
 #include <vector>
 
 #include "base/posix/unix_domain_socket_linux.h"
 #include "content/common/zygote_commands_linux.h"
 
 namespace content {
 
 bool SendZygoteChildPing(int fd) {
-  return UnixDomainSocket::SendMsg(fd,
-                                   kZygoteChildPingMessage,
-                                   sizeof(kZygoteChildPingMessage),
-                                   std::vector<int>());
+  return base::UnixDomainSocket::SendMsg(fd,
+                                         kZygoteChildPingMessage,
+                                         sizeof(kZygoteChildPingMessage),
+                                         std::vector<int>());
 }
 
 }  // namespace content