Update from https://crrev.com/333737

base/posix/unix_domain_socket_linux.h

 // Copyright (c) 2011 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.
 
 #ifndef BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_
 #define BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_
 
 #include <stdint.h>
 #include <sys/types.h>
 #include <vector>
 
 #include "base/base_export.h"
 #include "base/files/scoped_file.h"
 #include "base/memory/scoped_vector.h"
 #include "base/process/process_handle.h"
 
+namespace base {
+
 class Pickle;
 
 class BASE_EXPORT UnixDomainSocket {
  public:
   // Maximum number of file descriptors that can be read by RecvMsg().
   static const size_t kMaxFileDescriptors;
 
 #if !defined(OS_NACL_NONSFI)
   // Use to enable receiving process IDs in RecvMsgWithPid.  Should be called on
   // the receiving socket (i.e., the socket passed to RecvMsgWithPid). Returns
   // true if successful.
   static bool EnableReceiveProcessId(int fd);
 #endif  // !defined(OS_NACL_NONSFI)
 
   // Use sendmsg to write the given msg and include a vector of file
   // descriptors. Returns true if successful.
   static bool SendMsg(int fd,
                       const void* msg,
                       size_t length,
                       const std::vector<int>& fds);
 
   // Use recvmsg to read a message and an array of file descriptors. Returns
   // -1 on failure. Note: will read, at most, |kMaxFileDescriptors| descriptors.
   static ssize_t RecvMsg(int fd,
                          void* msg,
                          size_t length,
-                         ScopedVector<base::ScopedFD>* fds);
+                         ScopedVector<ScopedFD>* fds);
 
   // Same as RecvMsg above, but also returns the sender's process ID (as seen
   // from the caller's namespace).  However, before using this function to
   // receive process IDs, EnableReceiveProcessId() should be called on the
   // receiving socket.
   static ssize_t RecvMsgWithPid(int fd,
                                 void* msg,
                                 size_t length,
-                                ScopedVector<base::ScopedFD>* fds,
-                                base::ProcessId* pid);
+                                ScopedVector<ScopedFD>* fds,
+                                ProcessId* pid);
 
 #if !defined(OS_NACL_NONSFI)
   // Perform a sendmsg/recvmsg pair.
   //   1. This process creates a UNIX SEQPACKET socketpair. Using
   //      connection-oriented sockets (SEQPACKET or STREAM) is critical here,
   //      because if one of the ends closes the other one must be notified.
   //   2. This process writes a request to |fd| with an SCM_RIGHTS control
   //      message containing on end of the fresh socket pair.
   //   3. This process blocks reading from the other end of the fresh
   //      socketpair.
@@ skipping 21 matching lines @@
                                       int recvmsg_flags,
                                       int* result_fd,
                                       const Pickle& request);
 #endif  // !defined(OS_NACL_NONSFI)
  private:
   // Similar to RecvMsg, but allows to specify |flags| for recvmsg(2).
   static ssize_t RecvMsgWithFlags(int fd,
                                   void* msg,
                                   size_t length,
                                   int flags,
-                                  ScopedVector<base::ScopedFD>* fds,
-                                  base::ProcessId* pid);
+                                  ScopedVector<ScopedFD>* fds,
+                                  ProcessId* pid);
 };
 
+}  // namespace base
+
 #endif  // BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_